21128718

素因数分解:

$2^1\times 3^1\times {\mathrm{13}}^2\times {\mathrm{67}}^1\times {\mathrm{311}}^1$

素因数の和:409

約数の個数: 48

約数和(自身を含む): 46590336

約数和(自身を除く): 25461618

約数列:

[1, 2, 3, 6, 13, 26, 39, 67, 78, 134, 169, 201, 311, 338, 402, 507, 622, 871, 933, 1014, 1742, 1866, 2613, 4043, 5226, 8086, 11323, 12129, 20837, 22646, 24258, 33969, 41674, 52559, 62511, 67938, 105118, 125022, 157677, 270881, 315354, 541762, 812643, 1625286, 3521453, 7042906, 10564359, 21128718]

約数ペア:

[(1, 21128718), (2, 10564359), (3, 7042906), (6, 3521453), (13, 1625286), (26, 812643), (39, 541762), (67, 315354), (78, 270881), (134, 157677), (169, 125022), (201, 105118), (311, 67938), (338, 62511), (402, 52559), (507, 41674), (622, 33969), (871, 24258), (933, 22646), (1014, 20837), (1742, 12129), (1866, 11323), (2613, 8086), (4043, 5226)]