21540875

素因数分解:

$5^3\times {\mathrm{389}}^1\times {\mathrm{443}}^1$

素因数の和:847

約数の個数: 16

約数和(自身を含む): 27012960

約数和(自身を除く): 5472085

約数列:

[1, 5, 25, 125, 389, 443, 1945, 2215, 9725, 11075, 48625, 55375, 172327, 861635, 4308175, 21540875]

約数ペア:

[(1, 21540875), (5, 4308175), (25, 861635), (125, 172327), (389, 55375), (443, 48625), (1945, 11075), (2215, 9725)]