20181620

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{757}}^1$

素因数の和:840

約数の個数: 48

約数和(自身を含む): 44825088

約数和(自身を除く): 24643468

約数列:

[1, 2, 4, 5, 10, 20, 31, 43, 62, 86, 124, 155, 172, 215, 310, 430, 620, 757, 860, 1333, 1514, 2666, 3028, 3785, 5332, 6665, 7570, 13330, 15140, 23467, 26660, 32551, 46934, 65102, 93868, 117335, 130204, 162755, 234670, 325510, 469340, 651020, 1009081, 2018162, 4036324, 5045405, 10090810, 20181620]

約数ペア:

[(1, 20181620), (2, 10090810), (4, 5045405), (5, 4036324), (10, 2018162), (20, 1009081), (31, 651020), (43, 469340), (62, 325510), (86, 234670), (124, 162755), (155, 130204), (172, 117335), (215, 93868), (310, 65102), (430, 46934), (620, 32551), (757, 26660), (860, 23467), (1333, 15140), (1514, 13330), (2666, 7570), (3028, 6665), (3785, 5332)]