21689305

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{12721}}^1$

素因数の和:12768

約数の個数: 16

約数和(自身を含む): 29311488

約数和(自身を除く): 7622183

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 12721, 63605, 139931, 394351, 699655, 1971755, 4337861, 21689305]

約数ペア:

[(1, 21689305), (5, 4337861), (11, 1971755), (31, 699655), (55, 394351), (155, 139931), (341, 63605), (1705, 12721)]