19640900

素因数分解:

$2^2\times 5^2\times {\mathrm{197}}^1\times {\mathrm{997}}^1$

素因数の和:1208

約数の個数: 36

約数和(自身を含む): 42880068

約数和(自身を除く): 23239168

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 197, 394, 788, 985, 997, 1970, 1994, 3940, 3988, 4925, 4985, 9850, 9970, 19700, 19940, 24925, 49850, 99700, 196409, 392818, 785636, 982045, 1964090, 3928180, 4910225, 9820450, 19640900]

約数ペア:

[(1, 19640900), (2, 9820450), (4, 4910225), (5, 3928180), (10, 1964090), (20, 982045), (25, 785636), (50, 392818), (100, 196409), (197, 99700), (394, 49850), (788, 24925), (985, 19940), (997, 19700), (1970, 9970), (1994, 9850), (3940, 4985), (3988, 4925)]