678640

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{499}}^1$

素因数の和:529

約数の個数: 40

約数和(自身を含む): 1674000

約数和(自身を除く): 995360

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 499, 680, 998, 1360, 1996, 2495, 3992, 4990, 7984, 8483, 9980, 16966, 19960, 33932, 39920, 42415, 67864, 84830, 135728, 169660, 339320, 678640]

約数ペア:

[(1, 678640), (2, 339320), (4, 169660), (5, 135728), (8, 84830), (10, 67864), (16, 42415), (17, 39920), (20, 33932), (34, 19960), (40, 16966), (68, 9980), (80, 8483), (85, 7984), (136, 4990), (170, 3992), (272, 2495), (340, 1996), (499, 1360), (680, 998)]