19981715

素因数分解:

$5^1\times {\mathrm{13}}^3\times {\mathrm{17}}^1\times {\mathrm{107}}^1$

素因数の和:168

約数の個数: 32

約数和(自身を含む): 27760320

約数和(自身を除く): 7778605

約数列:

[1, 5, 13, 17, 65, 85, 107, 169, 221, 535, 845, 1105, 1391, 1819, 2197, 2873, 6955, 9095, 10985, 14365, 18083, 23647, 37349, 90415, 118235, 186745, 235079, 307411, 1175395, 1537055, 3996343, 19981715]

約数ペア:

[(1, 19981715), (5, 3996343), (13, 1537055), (17, 1175395), (65, 307411), (85, 235079), (107, 186745), (169, 118235), (221, 90415), (535, 37349), (845, 23647), (1105, 18083), (1391, 14365), (1819, 10985), (2197, 9095), (2873, 6955)]