21131408

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{77689}}^1$

素因数の和:77714

約数の個数: 20

約数和(自身を含む): 43351020

約数和(自身を除く): 22219612

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 77689, 155378, 310756, 621512, 1243024, 1320713, 2641426, 5282852, 10565704, 21131408]

約数ペア:

[(1, 21131408), (2, 10565704), (4, 5282852), (8, 2641426), (16, 1320713), (17, 1243024), (34, 621512), (68, 310756), (136, 155378), (272, 77689)]