21237957

素因数分解:

$3^9\times {\mathrm{13}}^1\times {\mathrm{83}}^1$

素因数の和:123

約数の個数: 40

約数和(自身を含む): 34720224

約数和(自身を除く): 13482267

約数列:

[1, 3, 9, 13, 27, 39, 81, 83, 117, 243, 249, 351, 729, 747, 1053, 1079, 2187, 2241, 3159, 3237, 6561, 6723, 9477, 9711, 19683, 20169, 28431, 29133, 60507, 85293, 87399, 181521, 255879, 262197, 544563, 786591, 1633689, 2359773, 7079319, 21237957]

約数ペア:

[(1, 21237957), (3, 7079319), (9, 2359773), (13, 1633689), (27, 786591), (39, 544563), (81, 262197), (83, 255879), (117, 181521), (243, 87399), (249, 85293), (351, 60507), (729, 29133), (747, 28431), (1053, 20169), (1079, 19683), (2187, 9711), (2241, 9477), (3159, 6723), (3237, 6561)]