21068840

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1307}}^1$

素因数の和:1362

約数の個数: 64

約数和(自身を含む): 52738560

約数和(自身を除く): 31669720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 52, 62, 65, 104, 124, 130, 155, 248, 260, 310, 403, 520, 620, 806, 1240, 1307, 1612, 2015, 2614, 3224, 4030, 5228, 6535, 8060, 10456, 13070, 16120, 16991, 26140, 33982, 40517, 52280, 67964, 81034, 84955, 135928, 162068, 169910, 202585, 324136, 339820, 405170, 526721, 679640, 810340, 1053442, 1620680, 2106884, 2633605, 4213768, 5267210, 10534420, 21068840]

約数ペア:

[(1, 21068840), (2, 10534420), (4, 5267210), (5, 4213768), (8, 2633605), (10, 2106884), (13, 1620680), (20, 1053442), (26, 810340), (31, 679640), (40, 526721), (52, 405170), (62, 339820), (65, 324136), (104, 202585), (124, 169910), (130, 162068), (155, 135928), (248, 84955), (260, 81034), (310, 67964), (403, 52280), (520, 40517), (620, 33982), (806, 26140), (1240, 16991), (1307, 16120), (1612, 13070), (2015, 10456), (2614, 8060), (3224, 6535), (4030, 5228)]