81865220

素因数分解:

$2^2\times 5^1\times {\mathrm{1489}}^1\times {\mathrm{2749}}^1$

素因数の和:4247

約数の個数: 24

約数和(自身を含む): 172095000

約数和(自身を除く): 90229780

約数列:

[1, 2, 4, 5, 10, 20, 1489, 2749, 2978, 5498, 5956, 7445, 10996, 13745, 14890, 27490, 29780, 54980, 4093261, 8186522, 16373044, 20466305, 40932610, 81865220]

約数ペア:

[(1, 81865220), (2, 40932610), (4, 20466305), (5, 16373044), (10, 8186522), (20, 4093261), (1489, 54980), (2749, 29780), (2978, 27490), (5498, 14890), (5956, 13745), (7445, 10996)]