21399515

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{271}}^1\times {\mathrm{929}}^1$

素因数の和:1222

約数の個数: 16

約数和(自身を含む): 27319680

約数和(自身を除く): 5920165

約数列:

[1, 5, 17, 85, 271, 929, 1355, 4607, 4645, 15793, 23035, 78965, 251759, 1258795, 4279903, 21399515]

約数ペア:

[(1, 21399515), (5, 4279903), (17, 1258795), (85, 251759), (271, 78965), (929, 23035), (1355, 15793), (4607, 4645)]