18990985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{12703}}^1$

素因数の和:12744

約数の個数: 16

約数和(自身を含む): 25611264

約数和(自身を除く): 6620279

約数列:

[1, 5, 13, 23, 65, 115, 299, 1495, 12703, 63515, 165139, 292169, 825695, 1460845, 3798197, 18990985]

約数ペア:

[(1, 18990985), (5, 3798197), (13, 1460845), (23, 825695), (65, 292169), (115, 165139), (299, 63515), (1495, 12703)]