20580980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{21001}}^1$

素因数の和:21024

約数の個数: 36

約数和(自身を含む): 50278788

約数和(自身を除く): 29697808

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 21001, 42002, 84004, 105005, 147007, 210010, 294014, 420020, 588028, 735035, 1029049, 1470070, 2058098, 2940140, 4116196, 5145245, 10290490, 20580980]

約数ペア:

[(1, 20580980), (2, 10290490), (4, 5145245), (5, 4116196), (7, 2940140), (10, 2058098), (14, 1470070), (20, 1029049), (28, 735035), (35, 588028), (49, 420020), (70, 294014), (98, 210010), (140, 147007), (196, 105005), (245, 84004), (490, 42002), (980, 21001)]