21498160

素因数分解:

$2^4\times 5^1\times {\mathrm{103}}^1\times {\mathrm{2609}}^1$

素因数の和:2725

約数の個数: 40

約数和(自身を含む): 50487840

約数和(自身を除く): 28989680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 103, 206, 412, 515, 824, 1030, 1648, 2060, 2609, 4120, 5218, 8240, 10436, 13045, 20872, 26090, 41744, 52180, 104360, 208720, 268727, 537454, 1074908, 1343635, 2149816, 2687270, 4299632, 5374540, 10749080, 21498160]

約数ペア:

[(1, 21498160), (2, 10749080), (4, 5374540), (5, 4299632), (8, 2687270), (10, 2149816), (16, 1343635), (20, 1074908), (40, 537454), (80, 268727), (103, 208720), (206, 104360), (412, 52180), (515, 41744), (824, 26090), (1030, 20872), (1648, 13045), (2060, 10436), (2609, 8240), (4120, 5218)]