21239920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{1571}}^1$

素因数の和:1610

約数の個数: 60

約数和(自身を含む): 53507736

約数和(自身を除く): 32267816

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 169, 208, 260, 338, 520, 676, 845, 1040, 1352, 1571, 1690, 2704, 3142, 3380, 6284, 6760, 7855, 12568, 13520, 15710, 20423, 25136, 31420, 40846, 62840, 81692, 102115, 125680, 163384, 204230, 265499, 326768, 408460, 530998, 816920, 1061996, 1327495, 1633840, 2123992, 2654990, 4247984, 5309980, 10619960, 21239920]

約数ペア:

[(1, 21239920), (2, 10619960), (4, 5309980), (5, 4247984), (8, 2654990), (10, 2123992), (13, 1633840), (16, 1327495), (20, 1061996), (26, 816920), (40, 530998), (52, 408460), (65, 326768), (80, 265499), (104, 204230), (130, 163384), (169, 125680), (208, 102115), (260, 81692), (338, 62840), (520, 40846), (676, 31420), (845, 25136), (1040, 20423), (1352, 15710), (1571, 13520), (1690, 12568), (2704, 7855), (3142, 6760), (3380, 6284)]