21990215

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{373}}^1\times {\mathrm{907}}^1$

素因数の和:1298

約数の個数: 16

約数和(自身を含む): 28525728

約数和(自身を除く): 6535513

約数列:

[1, 5, 13, 65, 373, 907, 1865, 4535, 4849, 11791, 24245, 58955, 338311, 1691555, 4398043, 21990215]

約数ペア:

[(1, 21990215), (5, 4398043), (13, 1691555), (65, 338311), (373, 58955), (907, 24245), (1865, 11791), (4535, 4849)]