20821640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{74363}}^1$

素因数の和:74381

約数の個数: 32

約数和(自身を含む): 53542080

約数和(自身を除く): 32720440

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 74363, 148726, 297452, 371815, 520541, 594904, 743630, 1041082, 1487260, 2082164, 2602705, 2974520, 4164328, 5205410, 10410820, 20821640]

約数ペア:

[(1, 20821640), (2, 10410820), (4, 5205410), (5, 4164328), (7, 2974520), (8, 2602705), (10, 2082164), (14, 1487260), (20, 1041082), (28, 743630), (35, 594904), (40, 520541), (56, 371815), (70, 297452), (140, 148726), (280, 74363)]