21993855

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^2\times {\mathrm{61}}^1$

素因数の和:168

約数の個数: 48

約数和(自身を含む): 39434976

約数和(自身を除く): 17441121

約数列:

[1, 3, 5, 13, 15, 39, 43, 61, 65, 129, 183, 195, 215, 305, 559, 645, 793, 915, 1677, 1849, 2379, 2623, 2795, 3965, 5547, 7869, 8385, 9245, 11895, 13115, 24037, 27735, 34099, 39345, 72111, 102297, 112789, 120185, 170495, 338367, 360555, 511485, 563945, 1466257, 1691835, 4398771, 7331285, 21993855]

約数ペア:

[(1, 21993855), (3, 7331285), (5, 4398771), (13, 1691835), (15, 1466257), (39, 563945), (43, 511485), (61, 360555), (65, 338367), (129, 170495), (183, 120185), (195, 112789), (215, 102297), (305, 72111), (559, 39345), (645, 34099), (793, 27735), (915, 24037), (1677, 13115), (1849, 11895), (2379, 9245), (2623, 8385), (2795, 7869), (3965, 5547)]