21284425

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{821}}^1$

素因数の和:909

約数の個数: 24

約数和(自身を含む): 28437912

約数和(自身を除く): 7153487

約数列:

[1, 5, 17, 25, 61, 85, 305, 425, 821, 1037, 1525, 4105, 5185, 13957, 20525, 25925, 50081, 69785, 250405, 348925, 851377, 1252025, 4256885, 21284425]

約数ペア:

[(1, 21284425), (5, 4256885), (17, 1252025), (25, 851377), (61, 348925), (85, 250405), (305, 69785), (425, 50081), (821, 25925), (1037, 20525), (1525, 13957), (4105, 5185)]