21084905

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{47}}^2\times {\mathrm{83}}^1$

素因数の和:205

約数の個数: 24

約数和(自身を含む): 27300672

約数和(自身を除く): 6215767

約数列:

[1, 5, 23, 47, 83, 115, 235, 415, 1081, 1909, 2209, 3901, 5405, 9545, 11045, 19505, 50807, 89723, 183347, 254035, 448615, 916735, 4216981, 21084905]

約数ペア:

[(1, 21084905), (5, 4216981), (23, 916735), (47, 448615), (83, 254035), (115, 183347), (235, 89723), (415, 50807), (1081, 19505), (1909, 11045), (2209, 9545), (3901, 5405)]