20581480

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{7247}}^1$

素因数の和:7329

約数の個数: 32

約数和(自身を含む): 46967040

約数和(自身を除く): 26385560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 7247, 14494, 28988, 36235, 57976, 72470, 144940, 289880, 514537, 1029074, 2058148, 2572685, 4116296, 5145370, 10290740, 20581480]

約数ペア:

[(1, 20581480), (2, 10290740), (4, 5145370), (5, 4116296), (8, 2572685), (10, 2058148), (20, 1029074), (40, 514537), (71, 289880), (142, 144940), (284, 72470), (355, 57976), (568, 36235), (710, 28988), (1420, 14494), (2840, 7247)]