21355971

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{571}}^1$

素因数の和:731

約数の個数: 32

約数和(自身を含む): 35363328

約数和(自身を除く): 14007357

約数列:

[1, 3, 7, 13, 21, 39, 91, 137, 273, 411, 571, 959, 1713, 1781, 2877, 3997, 5343, 7423, 11991, 12467, 22269, 37401, 51961, 78227, 155883, 234681, 547589, 1016951, 1642767, 3050853, 7118657, 21355971]

約数ペア:

[(1, 21355971), (3, 7118657), (7, 3050853), (13, 1642767), (21, 1016951), (39, 547589), (91, 234681), (137, 155883), (273, 78227), (411, 51961), (571, 37401), (959, 22269), (1713, 12467), (1781, 11991), (2877, 7423), (3997, 5343)]