21538940

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{26267}}^1$

素因数の和:26317

約数の個数: 24

約数和(自身を含む): 46336752

約数和(自身を除く): 24797812

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 26267, 52534, 105068, 131335, 262670, 525340, 1076947, 2153894, 4307788, 5384735, 10769470, 21538940]

約数ペア:

[(1, 21538940), (2, 10769470), (4, 5384735), (5, 4307788), (10, 2153894), (20, 1076947), (41, 525340), (82, 262670), (164, 131335), (205, 105068), (410, 52534), (820, 26267)]