21691784

素因数分解:

$2^3\times {\mathrm{139}}^1\times {\mathrm{19507}}^1$

素因数の和:19652

約数の個数: 16

約数和(自身を含む): 40966800

約数和(自身を除く): 19275016

約数列:

[1, 2, 4, 8, 139, 278, 556, 1112, 19507, 39014, 78028, 156056, 2711473, 5422946, 10845892, 21691784]

約数ペア:

[(1, 21691784), (2, 10845892), (4, 5422946), (8, 2711473), (139, 156056), (278, 78028), (556, 39014), (1112, 19507)]