21218680

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{75781}}^1$

素因数の和:75799

約数の個数: 32

約数和(自身を含む): 54563040

約数和(自身を除く): 33344360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 75781, 151562, 303124, 378905, 530467, 606248, 757810, 1060934, 1515620, 2121868, 2652335, 3031240, 4243736, 5304670, 10609340, 21218680]

約数ペア:

[(1, 21218680), (2, 10609340), (4, 5304670), (5, 4243736), (7, 3031240), (8, 2652335), (10, 2121868), (14, 1515620), (20, 1060934), (28, 757810), (35, 606248), (40, 530467), (56, 378905), (70, 303124), (140, 151562), (280, 75781)]