12821720

素因数分解:

$2^3\times 5^1\times {\mathrm{73}}^1\times {\mathrm{4391}}^1$

素因数の和:4475

約数の個数: 32

約数和(自身を含む): 29250720

約数和(自身を除く): 16429000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 73, 146, 292, 365, 584, 730, 1460, 2920, 4391, 8782, 17564, 21955, 35128, 43910, 87820, 175640, 320543, 641086, 1282172, 1602715, 2564344, 3205430, 6410860, 12821720]

約数ペア:

[(1, 12821720), (2, 6410860), (4, 3205430), (5, 2564344), (8, 1602715), (10, 1282172), (20, 641086), (40, 320543), (73, 175640), (146, 87820), (292, 43910), (365, 35128), (584, 21955), (730, 17564), (1460, 8782), (2920, 4391)]