20781228

素因数分解:

$2^2\times 3^1\times {\mathrm{13}}^1\times {\mathrm{133213}}^1$

素因数の和:133233

約数の個数: 24

約数和(自身を含む): 52219888

約数和(自身を除く): 31438660

約数列:

[1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156, 133213, 266426, 399639, 532852, 799278, 1598556, 1731769, 3463538, 5195307, 6927076, 10390614, 20781228]

約数ペア:

[(1, 20781228), (2, 10390614), (3, 6927076), (4, 5195307), (6, 3463538), (12, 1731769), (13, 1598556), (26, 799278), (39, 532852), (52, 399639), (78, 266426), (156, 133213)]