21351421

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{233}}^1$

素因数の和:325

約数の個数: 32

約数和(自身を含む): 28304640

約数和(自身を除く): 6953219

約数列:

[1, 7, 13, 19, 53, 91, 133, 233, 247, 371, 689, 1007, 1631, 1729, 3029, 4427, 4823, 7049, 12349, 13091, 21203, 30989, 57551, 86443, 91637, 160537, 234631, 402857, 1123759, 1642417, 3050203, 21351421]

約数ペア:

[(1, 21351421), (7, 3050203), (13, 1642417), (19, 1123759), (53, 402857), (91, 234631), (133, 160537), (233, 91637), (247, 86443), (371, 57551), (689, 30989), (1007, 21203), (1631, 13091), (1729, 12349), (3029, 7049), (4427, 4823)]