20728720

素因数分解:

$2^4\times 5^1\times {\mathrm{113}}^1\times {\mathrm{2293}}^1$

素因数の和:2419

約数の個数: 40

約数和(自身を含む): 48641976

約数和(自身を除く): 27913256

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 113, 226, 452, 565, 904, 1130, 1808, 2260, 2293, 4520, 4586, 9040, 9172, 11465, 18344, 22930, 36688, 45860, 91720, 183440, 259109, 518218, 1036436, 1295545, 2072872, 2591090, 4145744, 5182180, 10364360, 20728720]

約数ペア:

[(1, 20728720), (2, 10364360), (4, 5182180), (5, 4145744), (8, 2591090), (10, 2072872), (16, 1295545), (20, 1036436), (40, 518218), (80, 259109), (113, 183440), (226, 91720), (452, 45860), (565, 36688), (904, 22930), (1130, 18344), (1808, 11465), (2260, 9172), (2293, 9040), (4520, 4586)]