21281240

素因数分解:

$2^3\times 5^1\times {\mathrm{307}}^1\times {\mathrm{1733}}^1$

素因数の和:2051

約数の個数: 32

約数和(自身を含む): 48066480

約数和(自身を除く): 26785240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 307, 614, 1228, 1535, 1733, 2456, 3070, 3466, 6140, 6932, 8665, 12280, 13864, 17330, 34660, 69320, 532031, 1064062, 2128124, 2660155, 4256248, 5320310, 10640620, 21281240]

約数ペア:

[(1, 21281240), (2, 10640620), (4, 5320310), (5, 4256248), (8, 2660155), (10, 2128124), (20, 1064062), (40, 532031), (307, 69320), (614, 34660), (1228, 17330), (1535, 13864), (1733, 12280), (2456, 8665), (3070, 6932), (3466, 6140)]