21000287

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{263}}^1$

素因数の和:359

約数の個数: 32

約数和(自身を含む): 28283904

約数和(自身を除く): 7283617

約数列:

[1, 7, 11, 17, 61, 77, 119, 187, 263, 427, 671, 1037, 1309, 1841, 2893, 4471, 4697, 7259, 11407, 16043, 20251, 31297, 49181, 79849, 112301, 176473, 272731, 344267, 1235311, 1909117, 3000041, 21000287]

約数ペア:

[(1, 21000287), (7, 3000041), (11, 1909117), (17, 1235311), (61, 344267), (77, 272731), (119, 176473), (187, 112301), (263, 79849), (427, 49181), (671, 31297), (1037, 20251), (1309, 16043), (1841, 11407), (2893, 7259), (4471, 4697)]