19981221

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{227}}^1$

素因数の和:341

約数の個数: 32

約数和(自身を含む): 30081408

約数和(自身を除く): 10100187

約数列:

[1, 3, 13, 37, 39, 61, 111, 183, 227, 481, 681, 793, 1443, 2257, 2379, 2951, 6771, 8399, 8853, 13847, 25197, 29341, 41541, 88023, 109187, 180011, 327561, 512339, 540033, 1537017, 6660407, 19981221]

約数ペア:

[(1, 19981221), (3, 6660407), (13, 1537017), (37, 540033), (39, 512339), (61, 327561), (111, 180011), (183, 109187), (227, 88023), (481, 41541), (681, 29341), (793, 25197), (1443, 13847), (2257, 8853), (2379, 8399), (2951, 6771)]