21900280

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{5023}}^1$

素因数の和:5143

約数の個数: 32

約数和(自身を含む): 49737600

約数和(自身を除く): 27837320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 5023, 10046, 20092, 25115, 40184, 50230, 100460, 200920, 547507, 1095014, 2190028, 2737535, 4380056, 5475070, 10950140, 21900280]

約数ペア:

[(1, 21900280), (2, 10950140), (4, 5475070), (5, 4380056), (8, 2737535), (10, 2190028), (20, 1095014), (40, 547507), (109, 200920), (218, 100460), (436, 50230), (545, 40184), (872, 25115), (1090, 20092), (2180, 10046), (4360, 5023)]