21278452

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{31477}}^1$

素因数の和:31507

約数の個数: 18

約数和(自身を含む): 40323318

約数和(自身を除く): 19044866

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 31477, 62954, 125908, 409201, 818402, 1636804, 5319613, 10639226, 21278452]

約数ペア:

[(1, 21278452), (2, 10639226), (4, 5319613), (13, 1636804), (26, 818402), (52, 409201), (169, 125908), (338, 62954), (676, 31477)]