19750780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{1987}}^1$

素因数の和:2074

約数の個数: 48

約数和(自身を含む): 48093696

約数和(自身を除く): 28342916

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1987, 1988, 2485, 3974, 4970, 7948, 9935, 9940, 13909, 19870, 27818, 39740, 55636, 69545, 139090, 141077, 278180, 282154, 564308, 705385, 987539, 1410770, 1975078, 2821540, 3950156, 4937695, 9875390, 19750780]

約数ペア:

[(1, 19750780), (2, 9875390), (4, 4937695), (5, 3950156), (7, 2821540), (10, 1975078), (14, 1410770), (20, 987539), (28, 705385), (35, 564308), (70, 282154), (71, 278180), (140, 141077), (142, 139090), (284, 69545), (355, 55636), (497, 39740), (710, 27818), (994, 19870), (1420, 13909), (1987, 9940), (1988, 9935), (2485, 7948), (3974, 4970)]