21638225

素因数分解:

$5^2\times 7^1\times {\mathrm{61}}^1\times {\mathrm{2027}}^1$

素因数の和:2105

約数の個数: 24

約数和(自身を含む): 31182528

約数和(自身を除く): 9544303

約数列:

[1, 5, 7, 25, 35, 61, 175, 305, 427, 1525, 2027, 2135, 10135, 10675, 14189, 50675, 70945, 123647, 354725, 618235, 865529, 3091175, 4327645, 21638225]

約数ペア:

[(1, 21638225), (5, 4327645), (7, 3091175), (25, 865529), (35, 618235), (61, 354725), (175, 123647), (305, 70945), (427, 50675), (1525, 14189), (2027, 10675), (2135, 10135)]