21721808

素因数分解:

$2^4\times {\mathrm{139}}^1\times {\mathrm{9767}}^1$

素因数の和:9914

約数の個数: 20

約数和(自身を含む): 42393120

約数和(自身を除く): 20671312

約数列:

[1, 2, 4, 8, 16, 139, 278, 556, 1112, 2224, 9767, 19534, 39068, 78136, 156272, 1357613, 2715226, 5430452, 10860904, 21721808]

約数ペア:

[(1, 21721808), (2, 10860904), (4, 5430452), (8, 2715226), (16, 1357613), (139, 156272), (278, 78136), (556, 39068), (1112, 19534), (2224, 9767)]