20457040

素因数分解:

$2^4\times 5^1\times {\mathrm{255713}}^1$

素因数の和:255726

約数の個数: 20

約数和(自身を含む): 47562804

約数和(自身を除く): 27105764

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 255713, 511426, 1022852, 1278565, 2045704, 2557130, 4091408, 5114260, 10228520, 20457040]

約数ペア:

[(1, 20457040), (2, 10228520), (4, 5114260), (5, 4091408), (8, 2557130), (10, 2045704), (16, 1278565), (20, 1022852), (40, 511426), (80, 255713)]