18219920

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{13397}}^1$

素因数の和:13427

約数の個数: 40

約数和(自身を含む): 44856504

約数和(自身を除く): 26636584

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 13397, 26794, 53588, 66985, 107176, 133970, 214352, 227749, 267940, 455498, 535880, 910996, 1071760, 1138745, 1821992, 2277490, 3643984, 4554980, 9109960, 18219920]

約数ペア:

[(1, 18219920), (2, 9109960), (4, 4554980), (5, 3643984), (8, 2277490), (10, 1821992), (16, 1138745), (17, 1071760), (20, 910996), (34, 535880), (40, 455498), (68, 267940), (80, 227749), (85, 214352), (136, 133970), (170, 107176), (272, 66985), (340, 53588), (680, 26794), (1360, 13397)]