21815120

素因数分解:

$2^4\times 5^1\times {\mathrm{389}}^1\times {\mathrm{701}}^1$

素因数の和:1103

約数の個数: 40

約数和(自身を含む): 50923080

約数和(自身を除く): 29107960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 389, 701, 778, 1402, 1556, 1945, 2804, 3112, 3505, 3890, 5608, 6224, 7010, 7780, 11216, 14020, 15560, 28040, 31120, 56080, 272689, 545378, 1090756, 1363445, 2181512, 2726890, 4363024, 5453780, 10907560, 21815120]

約数ペア:

[(1, 21815120), (2, 10907560), (4, 5453780), (5, 4363024), (8, 2726890), (10, 2181512), (16, 1363445), (20, 1090756), (40, 545378), (80, 272689), (389, 56080), (701, 31120), (778, 28040), (1402, 15560), (1556, 14020), (1945, 11216), (2804, 7780), (3112, 7010), (3505, 6224), (3890, 5608)]