20639780

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{21061}}^1$

素因数の和:21084

約数の個数: 36

約数和(自身を含む): 50422428

約数和(自身を除く): 29782648

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 21061, 42122, 84244, 105305, 147427, 210610, 294854, 421220, 589708, 737135, 1031989, 1474270, 2063978, 2948540, 4127956, 5159945, 10319890, 20639780]

約数ペア:

[(1, 20639780), (2, 10319890), (4, 5159945), (5, 4127956), (7, 2948540), (10, 2063978), (14, 1474270), (20, 1031989), (28, 737135), (35, 589708), (49, 421220), (70, 294854), (98, 210610), (140, 147427), (196, 105305), (245, 84244), (490, 42122), (980, 21061)]