21253765

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{4139}}^1$

素因数の和:4236

約数の個数: 16

約数和(自身を含む): 27820800

約数和(自身を除く): 6567035

約数列:

[1, 5, 13, 65, 79, 395, 1027, 4139, 5135, 20695, 53807, 269035, 326981, 1634905, 4250753, 21253765]

約数ペア:

[(1, 21253765), (5, 4250753), (13, 1634905), (65, 326981), (79, 269035), (395, 53807), (1027, 20695), (4139, 5135)]