21217665

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{397}}^1\times {\mathrm{509}}^1$

素因数の和:921

約数の個数: 32

約数和(自身を含む): 38972160

約数和(自身を除く): 17754495

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 397, 509, 1191, 1527, 1985, 2545, 2779, 3563, 5955, 7635, 8337, 10689, 13895, 17815, 41685, 53445, 202073, 606219, 1010365, 1414511, 3031095, 4243533, 7072555, 21217665]

約数ペア:

[(1, 21217665), (3, 7072555), (5, 4243533), (7, 3031095), (15, 1414511), (21, 1010365), (35, 606219), (105, 202073), (397, 53445), (509, 41685), (1191, 17815), (1527, 13895), (1985, 10689), (2545, 8337), (2779, 7635), (3563, 5955)]