20123079440

素因数分解:

$2^4\times 5^1\times {\mathrm{257}}^1\times {\mathrm{978749}}^1$

素因数の和:979019

約数の個数: 40

約数和(自身を含む): 46968255000

約数和(自身を除く): 26845175560

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 257, 514, 1028, 1285, 2056, 2570, 4112, 5140, 10280, 20560, 978749, 1957498, 3914996, 4893745, 7829992, 9787490, 15659984, 19574980, 39149960, 78299920, 251538493, 503076986, 1006153972, 1257692465, 2012307944, 2515384930, 4024615888, 5030769860, 10061539720, 20123079440]

約数ペア:

[(1, 20123079440), (2, 10061539720), (4, 5030769860), (5, 4024615888), (8, 2515384930), (10, 2012307944), (16, 1257692465), (20, 1006153972), (40, 503076986), (80, 251538493), (257, 78299920), (514, 39149960), (1028, 19574980), (1285, 15659984), (2056, 9787490), (2570, 7829992), (4112, 4893745), (5140, 3914996), (10280, 1957498), (20560, 978749)]