21039668

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{401}}^1\times {\mathrm{1009}}^1$

素因数の和:1427

約数の個数: 24

約数和(自身を含む): 39789960

約数和(自身を除く): 18750292

約数列:

[1, 2, 4, 13, 26, 52, 401, 802, 1009, 1604, 2018, 4036, 5213, 10426, 13117, 20852, 26234, 52468, 404609, 809218, 1618436, 5259917, 10519834, 21039668]

約数ペア:

[(1, 21039668), (2, 10519834), (4, 5259917), (13, 1618436), (26, 809218), (52, 404609), (401, 52468), (802, 26234), (1009, 20852), (1604, 13117), (2018, 10426), (4036, 5213)]