21248420

素因数分解:

$2^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{5393}}^1$

素因数の和:5599

約数の個数: 24

約数和(自身を含む): 44856504

約数和(自身を除く): 23608084

約数列:

[1, 2, 4, 5, 10, 20, 197, 394, 788, 985, 1970, 3940, 5393, 10786, 21572, 26965, 53930, 107860, 1062421, 2124842, 4249684, 5312105, 10624210, 21248420]

約数ペア:

[(1, 21248420), (2, 10624210), (4, 5312105), (5, 4249684), (10, 2124842), (20, 1062421), (197, 107860), (394, 53930), (788, 26965), (985, 21572), (1970, 10786), (3940, 5393)]