28090120

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{101}}^1\times {\mathrm{409}}^1$

素因数の和:538

約数の個数: 64

約数和(自身を含む): 67748400

約数和(自身を除く): 39658280

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 101, 136, 170, 202, 340, 404, 409, 505, 680, 808, 818, 1010, 1636, 1717, 2020, 2045, 3272, 3434, 4040, 4090, 6868, 6953, 8180, 8585, 13736, 13906, 16360, 17170, 27812, 34340, 34765, 41309, 55624, 68680, 69530, 82618, 139060, 165236, 206545, 278120, 330472, 413090, 702253, 826180, 1404506, 1652360, 2809012, 3511265, 5618024, 7022530, 14045060, 28090120]

約数ペア:

[(1, 28090120), (2, 14045060), (4, 7022530), (5, 5618024), (8, 3511265), (10, 2809012), (17, 1652360), (20, 1404506), (34, 826180), (40, 702253), (68, 413090), (85, 330472), (101, 278120), (136, 206545), (170, 165236), (202, 139060), (340, 82618), (404, 69530), (409, 68680), (505, 55624), (680, 41309), (808, 34765), (818, 34340), (1010, 27812), (1636, 17170), (1717, 16360), (2020, 13906), (2045, 13736), (3272, 8585), (3434, 8180), (4040, 6953), (4090, 6868)]