21385845

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{263}}^1$

素因数の和:426

約数の個数: 48

約数和(自身を含む): 40360320

約数和(自身を除く): 18974475

約数列:

[1, 3, 5, 9, 13, 15, 39, 45, 65, 117, 139, 195, 263, 417, 585, 695, 789, 1251, 1315, 1807, 2085, 2367, 3419, 3945, 5421, 6255, 9035, 10257, 11835, 16263, 17095, 27105, 30771, 36557, 51285, 81315, 109671, 153855, 182785, 329013, 475241, 548355, 1425723, 1645065, 2376205, 4277169, 7128615, 21385845]

約数ペア:

[(1, 21385845), (3, 7128615), (5, 4277169), (9, 2376205), (13, 1645065), (15, 1425723), (39, 548355), (45, 475241), (65, 329013), (117, 182785), (139, 153855), (195, 109671), (263, 81315), (417, 51285), (585, 36557), (695, 30771), (789, 27105), (1251, 17095), (1315, 16263), (1807, 11835), (2085, 10257), (2367, 9035), (3419, 6255), (3945, 5421)]