21880209

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{59}}^1\times {\mathrm{257}}^1$

素因数の和:369

約数の個数: 32

約数和(自身を含む): 32941440

約数和(自身を除く): 11061231

約数列:

[1, 3, 13, 37, 39, 59, 111, 177, 257, 481, 767, 771, 1443, 2183, 2301, 3341, 6549, 9509, 10023, 15163, 28379, 28527, 45489, 85137, 123617, 197119, 370851, 561031, 591357, 1683093, 7293403, 21880209]

約数ペア:

[(1, 21880209), (3, 7293403), (13, 1683093), (37, 591357), (39, 561031), (59, 370851), (111, 197119), (177, 123617), (257, 85137), (481, 45489), (767, 28527), (771, 28379), (1443, 15163), (2183, 10023), (2301, 9509), (3341, 6549)]