19980520

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{71359}}^1$

素因数の和:71377

約数の個数: 32

約数和(自身を含む): 51379200

約数和(自身を除く): 31398680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 71359, 142718, 285436, 356795, 499513, 570872, 713590, 999026, 1427180, 1998052, 2497565, 2854360, 3996104, 4995130, 9990260, 19980520]

約数ペア:

[(1, 19980520), (2, 9990260), (4, 4995130), (5, 3996104), (7, 2854360), (8, 2497565), (10, 1998052), (14, 1427180), (20, 999026), (28, 713590), (35, 570872), (40, 499513), (56, 356795), (70, 285436), (140, 142718), (280, 71359)]