21390825

素因数分解:

$3^1\times 5^2\times {\mathrm{73}}^1\times {\mathrm{3907}}^1$

素因数の和:3993

約数の個数: 24

約数和(自身を含む): 35859808

約数和(自身を除く): 14468983

約数列:

[1, 3, 5, 15, 25, 73, 75, 219, 365, 1095, 1825, 3907, 5475, 11721, 19535, 58605, 97675, 285211, 293025, 855633, 1426055, 4278165, 7130275, 21390825]

約数ペア:

[(1, 21390825), (3, 7130275), (5, 4278165), (15, 1426055), (25, 855633), (73, 293025), (75, 285211), (219, 97675), (365, 58605), (1095, 19535), (1825, 11721), (3907, 5475)]