81409820

素因数分解:

$2^2\times 5^1\times {\mathrm{1249}}^1\times {\mathrm{3259}}^1$

素因数の和:4517

約数の個数: 24

約数和(自身を含む): 171150000

約数和(自身を除く): 89740180

約数列:

[1, 2, 4, 5, 10, 20, 1249, 2498, 3259, 4996, 6245, 6518, 12490, 13036, 16295, 24980, 32590, 65180, 4070491, 8140982, 16281964, 20352455, 40704910, 81409820]

約数ペア:

[(1, 81409820), (2, 40704910), (4, 20352455), (5, 16281964), (10, 8140982), (20, 4070491), (1249, 65180), (2498, 32590), (3259, 24980), (4996, 16295), (6245, 13036), (6518, 12490)]