19997020

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{443}}^1$

素因数の和:550

約数の個数: 48

約数和(自身を含む): 43934688

約数和(自身を除く): 23937668

約数列:

[1, 2, 4, 5, 10, 20, 37, 61, 74, 122, 148, 185, 244, 305, 370, 443, 610, 740, 886, 1220, 1772, 2215, 2257, 4430, 4514, 8860, 9028, 11285, 16391, 22570, 27023, 32782, 45140, 54046, 65564, 81955, 108092, 135115, 163910, 270230, 327820, 540460, 999851, 1999702, 3999404, 4999255, 9998510, 19997020]

約数ペア:

[(1, 19997020), (2, 9998510), (4, 4999255), (5, 3999404), (10, 1999702), (20, 999851), (37, 540460), (61, 327820), (74, 270230), (122, 163910), (148, 135115), (185, 108092), (244, 81955), (305, 65564), (370, 54046), (443, 45140), (610, 32782), (740, 27023), (886, 22570), (1220, 16391), (1772, 11285), (2215, 9028), (2257, 8860), (4430, 4514)]