20990893

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{109}}^1$

素因数の和:229

約数の個数: 32

約数和(自身を含む): 27498240

約数和(自身を除く): 6507347

約数列:

[1, 7, 11, 41, 61, 77, 109, 287, 427, 451, 671, 763, 1199, 2501, 3157, 4469, 4697, 6649, 8393, 17507, 27511, 31283, 46543, 49159, 73139, 192577, 272609, 344113, 511973, 1908263, 2998699, 20990893]

約数ペア:

[(1, 20990893), (7, 2998699), (11, 1908263), (41, 511973), (61, 344113), (77, 272609), (109, 192577), (287, 73139), (427, 49159), (451, 46543), (671, 31283), (763, 27511), (1199, 17507), (2501, 8393), (3157, 6649), (4469, 4697)]