21490520

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{28277}}^1$

素因数の和:28307

約数の個数: 32

約数和(自身を含む): 50900400

約数和(自身を除く): 29409880

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 152, 190, 380, 760, 28277, 56554, 113108, 141385, 226216, 282770, 537263, 565540, 1074526, 1131080, 2149052, 2686315, 4298104, 5372630, 10745260, 21490520]

約数ペア:

[(1, 21490520), (2, 10745260), (4, 5372630), (5, 4298104), (8, 2686315), (10, 2149052), (19, 1131080), (20, 1074526), (38, 565540), (40, 537263), (76, 282770), (95, 226216), (152, 141385), (190, 113108), (380, 56554), (760, 28277)]