21810515

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{223}}^1\times {\mathrm{631}}^1$

素因数の和:890

約数の個数: 16

約数和(自身を含む): 27181056

約数和(自身を除く): 5370541

約数列:

[1, 5, 31, 155, 223, 631, 1115, 3155, 6913, 19561, 34565, 97805, 140713, 703565, 4362103, 21810515]

約数ペア:

[(1, 21810515), (5, 4362103), (31, 703565), (155, 140713), (223, 97805), (631, 34565), (1115, 19561), (3155, 6913)]