21117591

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{173}}^1$

素因数の和:333

約数の個数: 40

約数和(自身を含む): 34865424

約数和(自身を除く): 13747833

約数列:

[1, 3, 9, 11, 27, 33, 81, 99, 137, 173, 297, 411, 519, 891, 1233, 1507, 1557, 1903, 3699, 4521, 4671, 5709, 11097, 13563, 14013, 17127, 23701, 40689, 51381, 71103, 122067, 154143, 213309, 260711, 639927, 782133, 1919781, 2346399, 7039197, 21117591]

約数ペア:

[(1, 21117591), (3, 7039197), (9, 2346399), (11, 1919781), (27, 782133), (33, 639927), (81, 260711), (99, 213309), (137, 154143), (173, 122067), (297, 71103), (411, 51381), (519, 40689), (891, 23701), (1233, 17127), (1507, 14013), (1557, 13563), (1903, 11097), (3699, 5709), (4521, 4671)]