20718964

素因数分解:

$2^2\times 7^2\times {\mathrm{37}}^1\times {\mathrm{2857}}^1$

素因数の和:2912

約数の個数: 36

約数和(自身を含む): 43332996

約数和(自身を除く): 22614032

約数列:

[1, 2, 4, 7, 14, 28, 37, 49, 74, 98, 148, 196, 259, 518, 1036, 1813, 2857, 3626, 5714, 7252, 11428, 19999, 39998, 79996, 105709, 139993, 211418, 279986, 422836, 559972, 739963, 1479926, 2959852, 5179741, 10359482, 20718964]

約数ペア:

[(1, 20718964), (2, 10359482), (4, 5179741), (7, 2959852), (14, 1479926), (28, 739963), (37, 559972), (49, 422836), (74, 279986), (98, 211418), (148, 139993), (196, 105709), (259, 79996), (518, 39998), (1036, 19999), (1813, 11428), (2857, 7252), (3626, 5714)]