397940

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{197}}^1$

素因数の和:307

約数の個数: 24

約数和(自身を含む): 848232

約数和(自身を除く): 450292

約数列:

[1, 2, 4, 5, 10, 20, 101, 197, 202, 394, 404, 505, 788, 985, 1010, 1970, 2020, 3940, 19897, 39794, 79588, 99485, 198970, 397940]

約数ペア:

[(1, 397940), (2, 198970), (4, 99485), (5, 79588), (10, 39794), (20, 19897), (101, 3940), (197, 2020), (202, 1970), (394, 1010), (404, 985), (505, 788)]