20391415

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{113}}^1\times {\mathrm{193}}^1$

素因数の和:339

約数の個数: 32

約数和(自身を含む): 28662336

約数和(自身を除く): 8270921

約数列:

[1, 5, 11, 17, 55, 85, 113, 187, 193, 565, 935, 965, 1243, 1921, 2123, 3281, 6215, 9605, 10615, 16405, 21131, 21809, 36091, 105655, 109045, 180455, 239899, 370753, 1199495, 1853765, 4078283, 20391415]

約数ペア:

[(1, 20391415), (5, 4078283), (11, 1853765), (17, 1199495), (55, 370753), (85, 239899), (113, 180455), (187, 109045), (193, 105655), (565, 36091), (935, 21809), (965, 21131), (1243, 16405), (1921, 10615), (2123, 9605), (3281, 6215)]