20177780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{101}}^1\times {\mathrm{1427}}^1$

素因数の和:1544

約数の個数: 48

約数和(自身を含む): 48940416

約数和(自身を除く): 28762636

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 101, 140, 202, 404, 505, 707, 1010, 1414, 1427, 2020, 2828, 2854, 3535, 5708, 7070, 7135, 9989, 14140, 14270, 19978, 28540, 39956, 49945, 99890, 144127, 199780, 288254, 576508, 720635, 1008889, 1441270, 2017778, 2882540, 4035556, 5044445, 10088890, 20177780]

約数ペア:

[(1, 20177780), (2, 10088890), (4, 5044445), (5, 4035556), (7, 2882540), (10, 2017778), (14, 1441270), (20, 1008889), (28, 720635), (35, 576508), (70, 288254), (101, 199780), (140, 144127), (202, 99890), (404, 49945), (505, 39956), (707, 28540), (1010, 19978), (1414, 14270), (1427, 14140), (2020, 9989), (2828, 7135), (2854, 7070), (3535, 5708)]