647919

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{421}}^1$

素因数の和:452

約数の個数: 20

約数和(自身を含む): 1021240

約数和(自身を除く): 373321

約数列:

[1, 3, 9, 19, 27, 57, 81, 171, 421, 513, 1263, 1539, 3789, 7999, 11367, 23997, 34101, 71991, 215973, 647919]

約数ペア:

[(1, 647919), (3, 215973), (9, 71991), (19, 34101), (27, 23997), (57, 11367), (81, 7999), (171, 3789), (421, 1539), (513, 1263)]