21255640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{75913}}^1$

素因数の和:75931

約数の個数: 32

約数和(自身を含む): 54658080

約数和(自身を除く): 33402440

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 75913, 151826, 303652, 379565, 531391, 607304, 759130, 1062782, 1518260, 2125564, 2656955, 3036520, 4251128, 5313910, 10627820, 21255640]

約数ペア:

[(1, 21255640), (2, 10627820), (4, 5313910), (5, 4251128), (7, 3036520), (8, 2656955), (10, 2125564), (14, 1518260), (20, 1062782), (28, 759130), (35, 607304), (40, 531391), (56, 379565), (70, 303652), (140, 151826), (280, 75913)]