21212780

素因数分解:

$2^2\times 5^1\times {\mathrm{257}}^1\times {\mathrm{4127}}^1$

素因数の和:4393

約数の個数: 24

約数和(自身を含む): 44731008

約数和(自身を除く): 23518228

約数列:

[1, 2, 4, 5, 10, 20, 257, 514, 1028, 1285, 2570, 4127, 5140, 8254, 16508, 20635, 41270, 82540, 1060639, 2121278, 4242556, 5303195, 10606390, 21212780]

約数ペア:

[(1, 21212780), (2, 10606390), (4, 5303195), (5, 4242556), (10, 2121278), (20, 1060639), (257, 82540), (514, 41270), (1028, 20635), (1285, 16508), (2570, 8254), (4127, 5140)]