20121580

素因数分解:

$2^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{5107}}^1$

素因数の和:5313

約数の個数: 24

約数和(自身を含む): 42478128

約数和(自身を除く): 22356548

約数列:

[1, 2, 4, 5, 10, 20, 197, 394, 788, 985, 1970, 3940, 5107, 10214, 20428, 25535, 51070, 102140, 1006079, 2012158, 4024316, 5030395, 10060790, 20121580]

約数ペア:

[(1, 20121580), (2, 10060790), (4, 5030395), (5, 4024316), (10, 2012158), (20, 1006079), (197, 102140), (394, 51070), (788, 25535), (985, 20428), (1970, 10214), (3940, 5107)]