20945720

素因数分解:

$2^3\times 5^1\times {\mathrm{397}}^1\times {\mathrm{1319}}^1$

素因数の和:1727

約数の個数: 32

約数和(自身を含む): 47282400

約数和(自身を除く): 26336680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 397, 794, 1319, 1588, 1985, 2638, 3176, 3970, 5276, 6595, 7940, 10552, 13190, 15880, 26380, 52760, 523643, 1047286, 2094572, 2618215, 4189144, 5236430, 10472860, 20945720]

約数ペア:

[(1, 20945720), (2, 10472860), (4, 5236430), (5, 4189144), (8, 2618215), (10, 2094572), (20, 1047286), (40, 523643), (397, 52760), (794, 26380), (1319, 15880), (1588, 13190), (1985, 10552), (2638, 7940), (3176, 6595), (3970, 5276)]