21720255

素因数分解:

$3^1\times 5^1\times {\mathrm{479}}^1\times {\mathrm{3023}}^1$

素因数の和:3510

約数の個数: 16

約数和(自身を含む): 34836480

約数和(自身を除く): 13116225

約数列:

[1, 3, 5, 15, 479, 1437, 2395, 3023, 7185, 9069, 15115, 45345, 1448017, 4344051, 7240085, 21720255]

約数ペア:

[(1, 21720255), (3, 7240085), (5, 4344051), (15, 1448017), (479, 45345), (1437, 15115), (2395, 9069), (3023, 7185)]