18987885

素因数分解:

$3^3\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{283}}^1$

素因数の和:375

約数の個数: 64

約数和(自身を含む): 39260160

約数和(自身を除く): 20272275

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 71, 105, 135, 189, 213, 283, 315, 355, 497, 639, 849, 945, 1065, 1415, 1491, 1917, 1981, 2485, 2547, 3195, 4245, 4473, 5943, 7455, 7641, 9585, 9905, 12735, 13419, 17829, 20093, 22365, 29715, 38205, 53487, 60279, 67095, 89145, 100465, 140651, 180837, 267435, 301395, 421953, 542511, 703255, 904185, 1265859, 2109765, 2712555, 3797577, 6329295, 18987885]

約数ペア:

[(1, 18987885), (3, 6329295), (5, 3797577), (7, 2712555), (9, 2109765), (15, 1265859), (21, 904185), (27, 703255), (35, 542511), (45, 421953), (63, 301395), (71, 267435), (105, 180837), (135, 140651), (189, 100465), (213, 89145), (283, 67095), (315, 60279), (355, 53487), (497, 38205), (639, 29715), (849, 22365), (945, 20093), (1065, 17829), (1415, 13419), (1491, 12735), (1917, 9905), (1981, 9585), (2485, 7641), (2547, 7455), (3195, 5943), (4245, 4473)]