21655120

素因数分解:

$2^4\times 5^1\times {\mathrm{270689}}^1$

素因数の和:270702

約数の個数: 20

約数和(自身を含む): 50348340

約数和(自身を除く): 28693220

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 270689, 541378, 1082756, 1353445, 2165512, 2706890, 4331024, 5413780, 10827560, 21655120]

約数ペア:

[(1, 21655120), (2, 10827560), (4, 5413780), (5, 4331024), (8, 2706890), (10, 2165512), (16, 1353445), (20, 1082756), (40, 541378), (80, 270689)]