20907640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1297}}^1$

素因数の和:1352

約数の個数: 64

約数和(自身を含む): 52335360

約数和(自身を除く): 31427720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 52, 62, 65, 104, 124, 130, 155, 248, 260, 310, 403, 520, 620, 806, 1240, 1297, 1612, 2015, 2594, 3224, 4030, 5188, 6485, 8060, 10376, 12970, 16120, 16861, 25940, 33722, 40207, 51880, 67444, 80414, 84305, 134888, 160828, 168610, 201035, 321656, 337220, 402070, 522691, 674440, 804140, 1045382, 1608280, 2090764, 2613455, 4181528, 5226910, 10453820, 20907640]

約数ペア:

[(1, 20907640), (2, 10453820), (4, 5226910), (5, 4181528), (8, 2613455), (10, 2090764), (13, 1608280), (20, 1045382), (26, 804140), (31, 674440), (40, 522691), (52, 402070), (62, 337220), (65, 321656), (104, 201035), (124, 168610), (130, 160828), (155, 134888), (248, 84305), (260, 80414), (310, 67444), (403, 51880), (520, 40207), (620, 33722), (806, 25940), (1240, 16861), (1297, 16120), (1612, 12970), (2015, 10376), (2594, 8060), (3224, 6485), (4030, 5188)]