81497980

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{51581}}^1$

素因数の和:51669

約数の個数: 24

約数和(自身を含む): 173315520

約数和(自身を除く): 91817540

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 51581, 103162, 206324, 257905, 515810, 1031620, 4074899, 8149798, 16299596, 20374495, 40748990, 81497980]

約数ペア:

[(1, 81497980), (2, 40748990), (4, 20374495), (5, 16299596), (10, 8149798), (20, 4074899), (79, 1031620), (158, 515810), (316, 257905), (395, 206324), (790, 103162), (1580, 51581)]