20391980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{113}}^1\times {\mathrm{1289}}^1$

素因数の和:1418

約数の個数: 48

約数和(自身を含む): 49412160

約数和(自身を除く): 29020180

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 113, 140, 226, 452, 565, 791, 1130, 1289, 1582, 2260, 2578, 3164, 3955, 5156, 6445, 7910, 9023, 12890, 15820, 18046, 25780, 36092, 45115, 90230, 145657, 180460, 291314, 582628, 728285, 1019599, 1456570, 2039198, 2913140, 4078396, 5097995, 10195990, 20391980]

約数ペア:

[(1, 20391980), (2, 10195990), (4, 5097995), (5, 4078396), (7, 2913140), (10, 2039198), (14, 1456570), (20, 1019599), (28, 728285), (35, 582628), (70, 291314), (113, 180460), (140, 145657), (226, 90230), (452, 45115), (565, 36092), (791, 25780), (1130, 18046), (1289, 15820), (1582, 12890), (2260, 9023), (2578, 7910), (3164, 6445), (3955, 5156)]