21135920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20323}}^1$

素因数の和:20349

約数の個数: 40

約数和(自身を含む): 52923696

約数和(自身を除く): 31787776

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20323, 40646, 81292, 101615, 162584, 203230, 264199, 325168, 406460, 528398, 812920, 1056796, 1320995, 1625840, 2113592, 2641990, 4227184, 5283980, 10567960, 21135920]

約数ペア:

[(1, 21135920), (2, 10567960), (4, 5283980), (5, 4227184), (8, 2641990), (10, 2113592), (13, 1625840), (16, 1320995), (20, 1056796), (26, 812920), (40, 528398), (52, 406460), (65, 325168), (80, 264199), (104, 203230), (130, 162584), (208, 101615), (260, 81292), (520, 40646), (1040, 20323)]