19917640

素因数分解:

$2^3\times 5^1\times {\mathrm{449}}^1\times {\mathrm{1109}}^1$

素因数の和:1569

約数の個数: 32

約数和(自身を含む): 44955000

約数和(自身を除く): 25037360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 449, 898, 1109, 1796, 2218, 2245, 3592, 4436, 4490, 5545, 8872, 8980, 11090, 17960, 22180, 44360, 497941, 995882, 1991764, 2489705, 3983528, 4979410, 9958820, 19917640]

約数ペア:

[(1, 19917640), (2, 9958820), (4, 4979410), (5, 3983528), (8, 2489705), (10, 1991764), (20, 995882), (40, 497941), (449, 44360), (898, 22180), (1109, 17960), (1796, 11090), (2218, 8980), (2245, 8872), (3592, 5545), (4436, 4490)]