21217612

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{31387}}^1$

素因数の和:31417

約数の個数: 18

約数和(自身を含む): 40208028

約数和(自身を除く): 18990416

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 31387, 62774, 125548, 408031, 816062, 1632124, 5304403, 10608806, 21217612]

約数ペア:

[(1, 21217612), (2, 10608806), (4, 5304403), (13, 1632124), (26, 816062), (52, 408031), (169, 125548), (338, 62774), (676, 31387)]