21256975

素因数分解:

$5^2\times {\mathrm{53}}^1\times {\mathrm{61}}^1\times {\mathrm{263}}^1$

素因数の和:387

約数の個数: 24

約数和(自身を含む): 27400032

約数和(自身を除く): 6143057

約数列:

[1, 5, 25, 53, 61, 263, 265, 305, 1315, 1325, 1525, 3233, 6575, 13939, 16043, 16165, 69695, 80215, 80825, 348475, 401075, 850279, 4251395, 21256975]

約数ペア:

[(1, 21256975), (5, 4251395), (25, 850279), (53, 401075), (61, 348475), (263, 80825), (265, 80215), (305, 69695), (1315, 16165), (1325, 16043), (1525, 13939), (3233, 6575)]