81295220

素因数分解:

$2^2\times 5^1\times {\mathrm{431}}^1\times {\mathrm{9431}}^1$

素因数の和:9871

約数の個数: 24

約数和(自身を含む): 171134208

約数和(自身を除く): 89838988

約数列:

[1, 2, 4, 5, 10, 20, 431, 862, 1724, 2155, 4310, 8620, 9431, 18862, 37724, 47155, 94310, 188620, 4064761, 8129522, 16259044, 20323805, 40647610, 81295220]

約数ペア:

[(1, 81295220), (2, 40647610), (4, 20323805), (5, 16259044), (10, 8129522), (20, 4064761), (431, 188620), (862, 94310), (1724, 47155), (2155, 37724), (4310, 18862), (8620, 9431)]