21490515

素因数分解:

$3^4\times 5^1\times {\mathrm{47}}^1\times {\mathrm{1129}}^1$

素因数の和:1193

約数の個数: 40

約数和(自身を含む): 39378240

約数和(自身を除く): 17887725

約数列:

[1, 3, 5, 9, 15, 27, 45, 47, 81, 135, 141, 235, 405, 423, 705, 1129, 1269, 2115, 3387, 3807, 5645, 6345, 10161, 16935, 19035, 30483, 50805, 53063, 91449, 152415, 159189, 265315, 457245, 477567, 795945, 1432701, 2387835, 4298103, 7163505, 21490515]

約数ペア:

[(1, 21490515), (3, 7163505), (5, 4298103), (9, 2387835), (15, 1432701), (27, 795945), (45, 477567), (47, 457245), (81, 265315), (135, 159189), (141, 152415), (235, 91449), (405, 53063), (423, 50805), (705, 30483), (1129, 19035), (1269, 16935), (2115, 10161), (3387, 6345), (3807, 5645)]