21090979

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{4373}}^1$

素因数の和:4446

約数の個数: 16

約数和(自身を含む): 26453952

約数和(自身を除く): 5362973

約数列:

[1, 7, 13, 53, 91, 371, 689, 4373, 4823, 30611, 56849, 231769, 397943, 1622383, 3012997, 21090979]

約数ペア:

[(1, 21090979), (7, 3012997), (13, 1622383), (53, 397943), (91, 231769), (371, 56849), (689, 30611), (4373, 4823)]