21065740

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{557}}^1$

素因数の和:658

約数の個数: 48

約数和(自身を含む): 46497024

約数和(自身を除く): 25431284

約数列:

[1, 2, 4, 5, 10, 20, 31, 61, 62, 122, 124, 155, 244, 305, 310, 557, 610, 620, 1114, 1220, 1891, 2228, 2785, 3782, 5570, 7564, 9455, 11140, 17267, 18910, 33977, 34534, 37820, 67954, 69068, 86335, 135908, 169885, 172670, 339770, 345340, 679540, 1053287, 2106574, 4213148, 5266435, 10532870, 21065740]

約数ペア:

[(1, 21065740), (2, 10532870), (4, 5266435), (5, 4213148), (10, 2106574), (20, 1053287), (31, 679540), (61, 345340), (62, 339770), (122, 172670), (124, 169885), (155, 135908), (244, 86335), (305, 69068), (310, 67954), (557, 37820), (610, 34534), (620, 33977), (1114, 18910), (1220, 17267), (1891, 11140), (2228, 9455), (2785, 7564), (3782, 5570)]