21291428

素因数分解:

$2^2\times {\mathrm{37}}^1\times {\mathrm{263}}^1\times {\mathrm{547}}^1$

素因数の和:851

約数の個数: 24

約数和(自身を含む): 38482752

約数和(自身を除く): 17191324

約数列:

[1, 2, 4, 37, 74, 148, 263, 526, 547, 1052, 1094, 2188, 9731, 19462, 20239, 38924, 40478, 80956, 143861, 287722, 575444, 5322857, 10645714, 21291428]

約数ペア:

[(1, 21291428), (2, 10645714), (4, 5322857), (37, 575444), (74, 287722), (148, 143861), (263, 80956), (526, 40478), (547, 38924), (1052, 20239), (1094, 19462), (2188, 9731)]