21378279

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{107}}^1\times {\mathrm{109}}^1$

素因数の和:279

約数の個数: 32

約数和(自身を含む): 31933440

約数和(自身を除く): 10555161

約数列:

[1, 3, 13, 39, 47, 107, 109, 141, 321, 327, 611, 1391, 1417, 1833, 4173, 4251, 5029, 5123, 11663, 15087, 15369, 34989, 65377, 66599, 151619, 196131, 199797, 454857, 548161, 1644483, 7126093, 21378279]

約数ペア:

[(1, 21378279), (3, 7126093), (13, 1644483), (39, 548161), (47, 454857), (107, 199797), (109, 196131), (141, 151619), (321, 66599), (327, 65377), (611, 34989), (1391, 15369), (1417, 15087), (1833, 11663), (4173, 5123), (4251, 5029)]