18820240

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{5471}}^1$

素因数の和:5527

約数の個数: 40

約数和(自身を含む): 44782848

約数和(自身を除く): 25962608

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 5471, 10942, 21884, 27355, 43768, 54710, 87536, 109420, 218840, 235253, 437680, 470506, 941012, 1176265, 1882024, 2352530, 3764048, 4705060, 9410120, 18820240]

約数ペア:

[(1, 18820240), (2, 9410120), (4, 4705060), (5, 3764048), (8, 2352530), (10, 1882024), (16, 1176265), (20, 941012), (40, 470506), (43, 437680), (80, 235253), (86, 218840), (172, 109420), (215, 87536), (344, 54710), (430, 43768), (688, 27355), (860, 21884), (1720, 10942), (3440, 5471)]