64402840

素因数分解:

$2^3\times 5^1\times {\mathrm{389}}^1\times {\mathrm{4139}}^1$

素因数の和:4539

約数の個数: 32

約数和(自身を含む): 145314000

約数和(自身を除く): 80911160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 389, 778, 1556, 1945, 3112, 3890, 4139, 7780, 8278, 15560, 16556, 20695, 33112, 41390, 82780, 165560, 1610071, 3220142, 6440284, 8050355, 12880568, 16100710, 32201420, 64402840]

約数ペア:

[(1, 64402840), (2, 32201420), (4, 16100710), (5, 12880568), (8, 8050355), (10, 6440284), (20, 3220142), (40, 1610071), (389, 165560), (778, 82780), (1556, 41390), (1945, 33112), (3112, 20695), (3890, 16556), (4139, 15560), (7780, 8278)]