20997725

素因数分解:

$5^2\times 7^2\times {\mathrm{61}}^1\times {\mathrm{281}}^1$

素因数の和:366

約数の個数: 36

約数和(自身を含む): 30894228

約数和(自身を除く): 9896503

約数列:

[1, 5, 7, 25, 35, 49, 61, 175, 245, 281, 305, 427, 1225, 1405, 1525, 1967, 2135, 2989, 7025, 9835, 10675, 13769, 14945, 17141, 49175, 68845, 74725, 85705, 119987, 344225, 428525, 599935, 839909, 2999675, 4199545, 20997725]

約数ペア:

[(1, 20997725), (5, 4199545), (7, 2999675), (25, 839909), (35, 599935), (49, 428525), (61, 344225), (175, 119987), (245, 85705), (281, 74725), (305, 68845), (427, 49175), (1225, 17141), (1405, 14945), (1525, 13769), (1967, 10675), (2135, 9835), (2989, 7025)]