19988780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{67}}^1\times {\mathrm{2131}}^1$

素因数の和:2214

約数の個数: 48

約数和(自身を含む): 48711936

約数和(自身を除く): 28723156

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 67, 70, 134, 140, 268, 335, 469, 670, 938, 1340, 1876, 2131, 2345, 4262, 4690, 8524, 9380, 10655, 14917, 21310, 29834, 42620, 59668, 74585, 142777, 149170, 285554, 298340, 571108, 713885, 999439, 1427770, 1998878, 2855540, 3997756, 4997195, 9994390, 19988780]

約数ペア:

[(1, 19988780), (2, 9994390), (4, 4997195), (5, 3997756), (7, 2855540), (10, 1998878), (14, 1427770), (20, 999439), (28, 713885), (35, 571108), (67, 298340), (70, 285554), (134, 149170), (140, 142777), (268, 74585), (335, 59668), (469, 42620), (670, 29834), (938, 21310), (1340, 14917), (1876, 10655), (2131, 9380), (2345, 8524), (4262, 4690)]