19718559

素因数分解:

$3^4\times 7^1\times {\mathrm{83}}^1\times {\mathrm{419}}^1$

素因数の和:521

約数の個数: 40

約数和(自身を含む): 34151040

約数和(自身を除く): 14432481

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 83, 189, 249, 419, 567, 581, 747, 1257, 1743, 2241, 2933, 3771, 5229, 6723, 8799, 11313, 15687, 26397, 33939, 34777, 47061, 79191, 104331, 237573, 243439, 312993, 730317, 938979, 2190951, 2816937, 6572853, 19718559]

約数ペア:

[(1, 19718559), (3, 6572853), (7, 2816937), (9, 2190951), (21, 938979), (27, 730317), (63, 312993), (81, 243439), (83, 237573), (189, 104331), (249, 79191), (419, 47061), (567, 34777), (581, 33939), (747, 26397), (1257, 15687), (1743, 11313), (2241, 8799), (2933, 6723), (3771, 5229)]