21280625

素因数分解:

$5^4\times {\mathrm{79}}^1\times {\mathrm{431}}^1$

素因数の和:530

約数の個数: 20

約数和(自身を含む): 26991360

約数和(自身を除く): 5710735

約数列:

[1, 5, 25, 79, 125, 395, 431, 625, 1975, 2155, 9875, 10775, 34049, 49375, 53875, 170245, 269375, 851225, 4256125, 21280625]

約数ペア:

[(1, 21280625), (5, 4256125), (25, 851225), (79, 269375), (125, 170245), (395, 53875), (431, 49375), (625, 34049), (1975, 10775), (2155, 9875)]