21180691

素因数分解:

$7^2\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{541}}^1$

素因数の和:619

約数の個数: 24

約数和(自身を含む): 26692416

約数和(自身を除く): 5511725

約数列:

[1, 7, 17, 47, 49, 119, 329, 541, 799, 833, 2303, 3787, 5593, 9197, 25427, 26509, 39151, 64379, 177989, 432259, 450653, 1245923, 3025813, 21180691]

約数ペア:

[(1, 21180691), (7, 3025813), (17, 1245923), (47, 450653), (49, 432259), (119, 177989), (329, 64379), (541, 39151), (799, 26509), (833, 25427), (2303, 9197), (3787, 5593)]