21078123

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{283}}^1$

素因数の和:395

約数の個数: 32

約数和(自身を含む): 32116992

約数和(自身を除く): 11038869

約数列:

[1, 3, 11, 33, 37, 61, 111, 183, 283, 407, 671, 849, 1221, 2013, 2257, 3113, 6771, 9339, 10471, 17263, 24827, 31413, 51789, 74481, 115181, 189893, 345543, 569679, 638731, 1916193, 7026041, 21078123]

約数ペア:

[(1, 21078123), (3, 7026041), (11, 1916193), (33, 638731), (37, 569679), (61, 345543), (111, 189893), (183, 115181), (283, 74481), (407, 51789), (671, 31413), (849, 24827), (1221, 17263), (2013, 10471), (2257, 9339), (3113, 6771)]