21284440

素因数分解:

$2^3\times 5^1\times {\mathrm{107}}^1\times {\mathrm{4973}}^1$

素因数の和:5091

約数の個数: 32

約数和(自身を含む): 48347280

約数和(自身を除く): 27062840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 107, 214, 428, 535, 856, 1070, 2140, 4280, 4973, 9946, 19892, 24865, 39784, 49730, 99460, 198920, 532111, 1064222, 2128444, 2660555, 4256888, 5321110, 10642220, 21284440]

約数ペア:

[(1, 21284440), (2, 10642220), (4, 5321110), (5, 4256888), (8, 2660555), (10, 2128444), (20, 1064222), (40, 532111), (107, 198920), (214, 99460), (428, 49730), (535, 39784), (856, 24865), (1070, 19892), (2140, 9946), (4280, 4973)]