642285680

素因数分解:

$2^4\times 5^1\times {\mathrm{389}}^1\times {\mathrm{20639}}^1$

素因数の和:21041

約数の個数: 40

約数和(自身を含む): 1497225600

約数和(自身を除く): 854939920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 389, 778, 1556, 1945, 3112, 3890, 6224, 7780, 15560, 20639, 31120, 41278, 82556, 103195, 165112, 206390, 330224, 412780, 825560, 1651120, 8028571, 16057142, 32114284, 40142855, 64228568, 80285710, 128457136, 160571420, 321142840, 642285680]

約数ペア:

[(1, 642285680), (2, 321142840), (4, 160571420), (5, 128457136), (8, 80285710), (10, 64228568), (16, 40142855), (20, 32114284), (40, 16057142), (80, 8028571), (389, 1651120), (778, 825560), (1556, 412780), (1945, 330224), (3112, 206390), (3890, 165112), (6224, 103195), (7780, 82556), (15560, 41278), (20639, 31120)]