19937515

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{18043}}^1$

素因数の和:18078

約数の個数: 16

約数和(自身を含む): 27282528

約数和(自身を除く): 7345013

約数列:

[1, 5, 13, 17, 65, 85, 221, 1105, 18043, 90215, 234559, 306731, 1172795, 1533655, 3987503, 19937515]

約数ペア:

[(1, 19937515), (5, 3987503), (13, 1533655), (17, 1172795), (65, 306731), (85, 234559), (221, 90215), (1105, 18043)]