18980585

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{193}}^1$

素因数の和:317

約数の個数: 32

約数和(自身を含む): 26399520

約数和(自身を除く): 7418935

約数列:

[1, 5, 13, 17, 65, 85, 89, 193, 221, 445, 965, 1105, 1157, 1513, 2509, 3281, 5785, 7565, 12545, 16405, 17177, 19669, 42653, 85885, 98345, 213265, 223301, 292009, 1116505, 1460045, 3796117, 18980585]

約数ペア:

[(1, 18980585), (5, 3796117), (13, 1460045), (17, 1116505), (65, 292009), (85, 223301), (89, 213265), (193, 98345), (221, 85885), (445, 42653), (965, 19669), (1105, 17177), (1157, 16405), (1513, 12545), (2509, 7565), (3281, 5785)]