20571640

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8431}}^1$

素因数の和:8503

約数の個数: 32

約数和(自身を含む): 47050560

約数和(自身を除く): 26478920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8431, 16862, 33724, 42155, 67448, 84310, 168620, 337240, 514291, 1028582, 2057164, 2571455, 4114328, 5142910, 10285820, 20571640]

約数ペア:

[(1, 20571640), (2, 10285820), (4, 5142910), (5, 4114328), (8, 2571455), (10, 2057164), (20, 1028582), (40, 514291), (61, 337240), (122, 168620), (244, 84310), (305, 67448), (488, 42155), (610, 33724), (1220, 16862), (2440, 8431)]