21261515

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{113}}^1\times {\mathrm{311}}^1$

素因数の和:451

約数の個数: 24

約数和(自身を含む): 28383264

約数和(自身を除く): 7121749

約数列:

[1, 5, 11, 55, 113, 121, 311, 565, 605, 1243, 1555, 3421, 6215, 13673, 17105, 35143, 37631, 68365, 175715, 188155, 386573, 1932865, 4252303, 21261515]

約数ペア:

[(1, 21261515), (5, 4252303), (11, 1932865), (55, 386573), (113, 188155), (121, 175715), (311, 68365), (565, 37631), (605, 35143), (1243, 17105), (1555, 13673), (3421, 6215)]