21039725

素因数分解:

$5^2\times 7^1\times {\mathrm{109}}^1\times {\mathrm{1103}}^1$

素因数の和:1229

約数の個数: 24

約数和(自身を含む): 30117120

約数和(自身を除く): 9077395

約数列:

[1, 5, 7, 25, 35, 109, 175, 545, 763, 1103, 2725, 3815, 5515, 7721, 19075, 27575, 38605, 120227, 193025, 601135, 841589, 3005675, 4207945, 21039725]

約数ペア:

[(1, 21039725), (5, 4207945), (7, 3005675), (25, 841589), (35, 601135), (109, 193025), (175, 120227), (545, 38605), (763, 27575), (1103, 19075), (2725, 7721), (3815, 5515)]