21995275

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{101}}^1\times {\mathrm{281}}^1$

素因数の和:423

約数の個数: 24

約数和(自身を含む): 28533888

約数和(自身を除く): 6538613

約数列:

[1, 5, 25, 31, 101, 155, 281, 505, 775, 1405, 2525, 3131, 7025, 8711, 15655, 28381, 43555, 78275, 141905, 217775, 709525, 879811, 4399055, 21995275]

約数ペア:

[(1, 21995275), (5, 4399055), (25, 879811), (31, 709525), (101, 217775), (155, 141905), (281, 78275), (505, 43555), (775, 28381), (1405, 15655), (2525, 8711), (3131, 7025)]