20857580

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{307}}^1$

素因数の和:438

約数の個数: 48

約数和(自身を含む): 45534720

約数和(自身を除く): 24677140

約数列:

[1, 2, 4, 5, 10, 20, 43, 79, 86, 158, 172, 215, 307, 316, 395, 430, 614, 790, 860, 1228, 1535, 1580, 3070, 3397, 6140, 6794, 13201, 13588, 16985, 24253, 26402, 33970, 48506, 52804, 66005, 67940, 97012, 121265, 132010, 242530, 264020, 485060, 1042879, 2085758, 4171516, 5214395, 10428790, 20857580]

約数ペア:

[(1, 20857580), (2, 10428790), (4, 5214395), (5, 4171516), (10, 2085758), (20, 1042879), (43, 485060), (79, 264020), (86, 242530), (158, 132010), (172, 121265), (215, 97012), (307, 67940), (316, 66005), (395, 52804), (430, 48506), (614, 33970), (790, 26402), (860, 24253), (1228, 16985), (1535, 13588), (1580, 13201), (3070, 6794), (3397, 6140)]