19981521

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{16693}}^1$

素因数の和:16725

約数の個数: 24

約数和(自身を含む): 34723520

約数和(自身を除く): 14741999

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 133, 171, 399, 1197, 16693, 50079, 116851, 150237, 317167, 350553, 951501, 1051659, 2220169, 2854503, 6660507, 19981521]

約数ペア:

[(1, 19981521), (3, 6660507), (7, 2854503), (9, 2220169), (19, 1051659), (21, 951501), (57, 350553), (63, 317167), (133, 150237), (171, 116851), (399, 50079), (1197, 16693)]