21556665

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{173}}^1$

素因数の和:271

約数の個数: 64

約数和(自身を含む): 42094080

約数和(自身を除く): 20537415

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 65, 71, 117, 135, 173, 195, 213, 351, 355, 519, 585, 639, 865, 923, 1065, 1557, 1755, 1917, 2249, 2595, 2769, 3195, 4615, 4671, 6747, 7785, 8307, 9585, 11245, 12283, 13845, 20241, 23355, 24921, 33735, 36849, 41535, 60723, 61415, 101205, 110547, 124605, 159679, 184245, 303615, 331641, 479037, 552735, 798395, 1437111, 1658205, 2395185, 4311333, 7185555, 21556665]

約数ペア:

[(1, 21556665), (3, 7185555), (5, 4311333), (9, 2395185), (13, 1658205), (15, 1437111), (27, 798395), (39, 552735), (45, 479037), (65, 331641), (71, 303615), (117, 184245), (135, 159679), (173, 124605), (195, 110547), (213, 101205), (351, 61415), (355, 60723), (519, 41535), (585, 36849), (639, 33735), (865, 24921), (923, 23355), (1065, 20241), (1557, 13845), (1755, 12283), (1917, 11245), (2249, 9585), (2595, 8307), (2769, 7785), (3195, 6747), (4615, 4671)]