21425720

素因数分解:

$2^3\times 5^1\times {\mathrm{197}}^1\times {\mathrm{2719}}^1$

素因数の和:2927

約数の個数: 32

約数和(自身を含む): 48470400

約数和(自身を除く): 27044680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 197, 394, 788, 985, 1576, 1970, 2719, 3940, 5438, 7880, 10876, 13595, 21752, 27190, 54380, 108760, 535643, 1071286, 2142572, 2678215, 4285144, 5356430, 10712860, 21425720]

約数ペア:

[(1, 21425720), (2, 10712860), (4, 5356430), (5, 4285144), (8, 2678215), (10, 2142572), (20, 1071286), (40, 535643), (197, 108760), (394, 54380), (788, 27190), (985, 21752), (1576, 13595), (1970, 10876), (2719, 7880), (3940, 5438)]