21161240

素因数分解:

$2^3\times 5^1\times {\mathrm{73}}^1\times {\mathrm{7247}}^1$

素因数の和:7331

約数の個数: 32

約数和(自身を含む): 48271680

約数和(自身を除く): 27110440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 73, 146, 292, 365, 584, 730, 1460, 2920, 7247, 14494, 28988, 36235, 57976, 72470, 144940, 289880, 529031, 1058062, 2116124, 2645155, 4232248, 5290310, 10580620, 21161240]

約数ペア:

[(1, 21161240), (2, 10580620), (4, 5290310), (5, 4232248), (8, 2645155), (10, 2116124), (20, 1058062), (40, 529031), (73, 289880), (146, 144940), (292, 72470), (365, 57976), (584, 36235), (730, 28988), (1460, 14494), (2920, 7247)]