21821425

素因数分解:

$5^2\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{383}}^1$

素因数の和:489

約数の個数: 24

約数和(自身を含む): 28283904

約数和(自身を除く): 6462479

約数列:

[1, 5, 25, 43, 53, 215, 265, 383, 1075, 1325, 1915, 2279, 9575, 11395, 16469, 20299, 56975, 82345, 101495, 411725, 507475, 872857, 4364285, 21821425]

約数ペア:

[(1, 21821425), (5, 4364285), (25, 872857), (43, 507475), (53, 411725), (215, 101495), (265, 82345), (383, 56975), (1075, 20299), (1325, 16469), (1915, 11395), (2279, 9575)]