21391875

素因数分解:

$3^2\times 5^4\times {\mathrm{3803}}^1$

素因数の和:3829

約数の個数: 30

約数和(自身を含む): 38622012

約数和(自身を除く): 17230137

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 125, 225, 375, 625, 1125, 1875, 3803, 5625, 11409, 19015, 34227, 57045, 95075, 171135, 285225, 475375, 855675, 1426125, 2376875, 4278375, 7130625, 21391875]

約数ペア:

[(1, 21391875), (3, 7130625), (5, 4278375), (9, 2376875), (15, 1426125), (25, 855675), (45, 475375), (75, 285225), (125, 171135), (225, 95075), (375, 57045), (625, 34227), (1125, 19015), (1875, 11409), (3803, 5625)]