18987956

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1$

素因数の和:264

約数の個数: 48

約数和(自身を含む): 37537920

約数和(自身を除く): 18549964

約数列:

[1, 2, 4, 13, 26, 37, 52, 71, 74, 139, 142, 148, 278, 284, 481, 556, 923, 962, 1807, 1846, 1924, 2627, 3614, 3692, 5143, 5254, 7228, 9869, 10286, 10508, 19738, 20572, 34151, 39476, 66859, 68302, 128297, 133718, 136604, 256594, 267436, 365153, 513188, 730306, 1460612, 4746989, 9493978, 18987956]

約数ペア:

[(1, 18987956), (2, 9493978), (4, 4746989), (13, 1460612), (26, 730306), (37, 513188), (52, 365153), (71, 267436), (74, 256594), (139, 136604), (142, 133718), (148, 128297), (278, 68302), (284, 66859), (481, 39476), (556, 34151), (923, 20572), (962, 19738), (1807, 10508), (1846, 10286), (1924, 9869), (2627, 7228), (3614, 5254), (3692, 5143)]