20746840

素因数分解:

$2^3\times 5^1\times {\mathrm{509}}^1\times {\mathrm{1019}}^1$

素因数の和:1539

約数の個数: 32

約数和(自身を含む): 46818000

約数和(自身を除く): 26071160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509, 1018, 1019, 2036, 2038, 2545, 4072, 4076, 5090, 5095, 8152, 10180, 10190, 20360, 20380, 40760, 518671, 1037342, 2074684, 2593355, 4149368, 5186710, 10373420, 20746840]

約数ペア:

[(1, 20746840), (2, 10373420), (4, 5186710), (5, 4149368), (8, 2593355), (10, 2074684), (20, 1037342), (40, 518671), (509, 40760), (1018, 20380), (1019, 20360), (2036, 10190), (2038, 10180), (2545, 8152), (4072, 5095), (4076, 5090)]