19910205

素因数分解:

$3^5\times 5^1\times 7^1\times {\mathrm{2341}}^1$

素因数の和:2368

約数の個数: 48

約数和(自身を含む): 40919424

約数和(自身を除く): 21009219

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 81, 105, 135, 189, 243, 315, 405, 567, 945, 1215, 1701, 2341, 2835, 7023, 8505, 11705, 16387, 21069, 35115, 49161, 63207, 81935, 105345, 147483, 189621, 245805, 316035, 442449, 568863, 737415, 948105, 1327347, 2212245, 2844315, 3982041, 6636735, 19910205]

約数ペア:

[(1, 19910205), (3, 6636735), (5, 3982041), (7, 2844315), (9, 2212245), (15, 1327347), (21, 948105), (27, 737415), (35, 568863), (45, 442449), (63, 316035), (81, 245805), (105, 189621), (135, 147483), (189, 105345), (243, 81935), (315, 63207), (405, 49161), (567, 35115), (945, 21069), (1215, 16387), (1701, 11705), (2341, 8505), (2835, 7023)]