640744

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{101}}^1$

素因数の和:181

約数の個数: 32

約数和(自身を含む): 1328040

約数和(自身を除く): 687296

約数列:

[1, 2, 4, 8, 13, 26, 52, 61, 101, 104, 122, 202, 244, 404, 488, 793, 808, 1313, 1586, 2626, 3172, 5252, 6161, 6344, 10504, 12322, 24644, 49288, 80093, 160186, 320372, 640744]

約数ペア:

[(1, 640744), (2, 320372), (4, 160186), (8, 80093), (13, 49288), (26, 24644), (52, 12322), (61, 10504), (101, 6344), (104, 6161), (122, 5252), (202, 3172), (244, 2626), (404, 1586), (488, 1313), (793, 808)]