Vigesimal numbers band

Here's the digits: 0 = 0 1 = 1 2 = 2 3 = 3 4 = 4 5 = 5 6 = 6 7 = 7 8 = 8 9 = 9 ꯖ = 10 𐐁 = 11 Ჾ = 12 ⅃ = 13 Γ = 14 ਟ = 15 𐐀 = 16 ᔭ = 17 Ჲ = 18 ୧ = 19