64639240

素因数分解:

$2^3\times 5^1\times {\mathrm{1615981}}^1$

素因数の和:1615992

約数の個数: 16

約数和(自身を含む): 145438380

約数和(自身を除く): 80799140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 1615981, 3231962, 6463924, 8079905, 12927848, 16159810, 32319620, 64639240]

約数ペア:

[(1, 64639240), (2, 32319620), (4, 16159810), (5, 12927848), (8, 8079905), (10, 6463924), (20, 3231962), (40, 1615981)]