21165729

素因数分解:

$3^1\times {\mathrm{13}}^2\times {\mathrm{109}}^1\times {\mathrm{383}}^1$

素因数の和:521

約数の個数: 24

約数和(自身を含む): 30919680

約数和(自身を除く): 9753951

約数列:

[1, 3, 13, 39, 109, 169, 327, 383, 507, 1149, 1417, 4251, 4979, 14937, 18421, 41747, 55263, 64727, 125241, 194181, 542711, 1628133, 7055243, 21165729]

約数ペア:

[(1, 21165729), (3, 7055243), (13, 1628133), (39, 542711), (109, 194181), (169, 125241), (327, 64727), (383, 55263), (507, 41747), (1149, 18421), (1417, 14937), (4251, 4979)]