21509815

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{73}}^1\times {\mathrm{1901}}^1$

素因数の和:2010

約数の個数: 16

約数和(自身を含む): 27023616

約数和(自身を除く): 5513801

約数列:

[1, 5, 31, 73, 155, 365, 1901, 2263, 9505, 11315, 58931, 138773, 294655, 693865, 4301963, 21509815]

約数ペア:

[(1, 21509815), (5, 4301963), (31, 693865), (73, 294655), (155, 138773), (365, 58931), (1901, 11315), (2263, 9505)]