20505040

素因数分解:

$2^4\times 5^1\times {\mathrm{256313}}^1$

素因数の和:256326

約数の個数: 20

約数和(自身を含む): 47674404

約数和(自身を除く): 27169364

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 256313, 512626, 1025252, 1281565, 2050504, 2563130, 4101008, 5126260, 10252520, 20505040]

約数ペア:

[(1, 20505040), (2, 10252520), (4, 5126260), (5, 4101008), (8, 2563130), (10, 2050504), (16, 1281565), (20, 1025252), (40, 512626), (80, 256313)]