21891560

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{5021}}^1$

素因数の和:5141

約数の個数: 32

約数和(自身を含む): 49717800

約数和(自身を除く): 27826240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 5021, 10042, 20084, 25105, 40168, 50210, 100420, 200840, 547289, 1094578, 2189156, 2736445, 4378312, 5472890, 10945780, 21891560]

約数ペア:

[(1, 21891560), (2, 10945780), (4, 5472890), (5, 4378312), (8, 2736445), (10, 2189156), (20, 1094578), (40, 547289), (109, 200840), (218, 100420), (436, 50210), (545, 40168), (872, 25105), (1090, 20084), (2180, 10042), (4360, 5021)]