21728420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{155203}}^1$

素因数の和:155219

約数の個数: 24

約数和(自身を含む): 52148544

約数和(自身を除く): 30420124

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 155203, 310406, 620812, 776015, 1086421, 1552030, 2172842, 3104060, 4345684, 5432105, 10864210, 21728420]

約数ペア:

[(1, 21728420), (2, 10864210), (4, 5432105), (5, 4345684), (7, 3104060), (10, 2172842), (14, 1552030), (20, 1086421), (28, 776015), (35, 620812), (70, 310406), (140, 155203)]