21398680

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17257}}^1$

素因数の和:17299

約数の個数: 32

約数和(自身を含む): 49703040

約数和(自身を除く): 28304360

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17257, 34514, 69028, 86285, 138056, 172570, 345140, 534967, 690280, 1069934, 2139868, 2674835, 4279736, 5349670, 10699340, 21398680]

約数ペア:

[(1, 21398680), (2, 10699340), (4, 5349670), (5, 4279736), (8, 2674835), (10, 2139868), (20, 1069934), (31, 690280), (40, 534967), (62, 345140), (124, 172570), (155, 138056), (248, 86285), (310, 69028), (620, 34514), (1240, 17257)]