20780180

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{331}}^1$

素因数の和:456

約数の個数: 48

約数和(自身を含む): 45401664

約数和(自身を除く): 24621484

約数列:

[1, 2, 4, 5, 10, 20, 43, 73, 86, 146, 172, 215, 292, 331, 365, 430, 662, 730, 860, 1324, 1460, 1655, 3139, 3310, 6278, 6620, 12556, 14233, 15695, 24163, 28466, 31390, 48326, 56932, 62780, 71165, 96652, 120815, 142330, 241630, 284660, 483260, 1039009, 2078018, 4156036, 5195045, 10390090, 20780180]

約数ペア:

[(1, 20780180), (2, 10390090), (4, 5195045), (5, 4156036), (10, 2078018), (20, 1039009), (43, 483260), (73, 284660), (86, 241630), (146, 142330), (172, 120815), (215, 96652), (292, 71165), (331, 62780), (365, 56932), (430, 48326), (662, 31390), (730, 28466), (860, 24163), (1324, 15695), (1460, 14233), (1655, 12556), (3139, 6620), (3310, 6278)]