20972980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{21401}}^1$

素因数の和:21424

約数の個数: 36

約数和(自身を含む): 51236388

約数和(自身を除く): 30263408

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 21401, 42802, 85604, 107005, 149807, 214010, 299614, 428020, 599228, 749035, 1048649, 1498070, 2097298, 2996140, 4194596, 5243245, 10486490, 20972980]

約数ペア:

[(1, 20972980), (2, 10486490), (4, 5243245), (5, 4194596), (7, 2996140), (10, 2097298), (14, 1498070), (20, 1048649), (28, 749035), (35, 599228), (49, 428020), (70, 299614), (98, 214010), (140, 149807), (196, 107005), (245, 85604), (490, 42802), (980, 21401)]