642940

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:118

約数の個数: 48

約数和(自身を含む): 1499904

約数和(自身を除く): 856964

約数列:

[1, 2, 4, 5, 10, 17, 20, 31, 34, 61, 62, 68, 85, 122, 124, 155, 170, 244, 305, 310, 340, 527, 610, 620, 1037, 1054, 1220, 1891, 2074, 2108, 2635, 3782, 4148, 5185, 5270, 7564, 9455, 10370, 10540, 18910, 20740, 32147, 37820, 64294, 128588, 160735, 321470, 642940]

約数ペア:

[(1, 642940), (2, 321470), (4, 160735), (5, 128588), (10, 64294), (17, 37820), (20, 32147), (31, 20740), (34, 18910), (61, 10540), (62, 10370), (68, 9455), (85, 7564), (122, 5270), (124, 5185), (155, 4148), (170, 3782), (244, 2635), (305, 2108), (310, 2074), (340, 1891), (527, 1220), (610, 1054), (620, 1037)]