20056840

素因数分解:

$2^3\times 5^1\times {\mathrm{389}}^1\times {\mathrm{1289}}^1$

素因数の和:1689

約数の個数: 32

約数和(自身を含む): 45279000

約数和(自身を除く): 25222160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 389, 778, 1289, 1556, 1945, 2578, 3112, 3890, 5156, 6445, 7780, 10312, 12890, 15560, 25780, 51560, 501421, 1002842, 2005684, 2507105, 4011368, 5014210, 10028420, 20056840]

約数ペア:

[(1, 20056840), (2, 10028420), (4, 5014210), (5, 4011368), (8, 2507105), (10, 2005684), (20, 1002842), (40, 501421), (389, 51560), (778, 25780), (1289, 15560), (1556, 12890), (1945, 10312), (2578, 7780), (3112, 6445), (3890, 5156)]