20500720

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2351}}^1$

素因数の和:2473

約数の個数: 40

約数和(自身を含む): 48121920

約数和(自身を除く): 27621200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 2351, 4360, 4702, 8720, 9404, 11755, 18808, 23510, 37616, 47020, 94040, 188080, 256259, 512518, 1025036, 1281295, 2050072, 2562590, 4100144, 5125180, 10250360, 20500720]

約数ペア:

[(1, 20500720), (2, 10250360), (4, 5125180), (5, 4100144), (8, 2562590), (10, 2050072), (16, 1281295), (20, 1025036), (40, 512518), (80, 256259), (109, 188080), (218, 94040), (436, 47020), (545, 37616), (872, 23510), (1090, 18808), (1744, 11755), (2180, 9404), (2351, 8720), (4360, 4702)]