20910040

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12157}}^1$

素因数の和:12211

約数の個数: 32

約数和(自身を含む): 48145680

約数和(自身を除く): 27235640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12157, 24314, 48628, 60785, 97256, 121570, 243140, 486280, 522751, 1045502, 2091004, 2613755, 4182008, 5227510, 10455020, 20910040]

約数ペア:

[(1, 20910040), (2, 10455020), (4, 5227510), (5, 4182008), (8, 2613755), (10, 2091004), (20, 1045502), (40, 522751), (43, 486280), (86, 243140), (172, 121570), (215, 97256), (344, 60785), (430, 48628), (860, 24314), (1720, 12157)]