20978980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{8669}}^1$

素因数の和:8700

約数の個数: 36

約数和(自身を含む): 48430620

約数和(自身を除く): 27451640

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 121, 220, 242, 484, 605, 1210, 2420, 8669, 17338, 34676, 43345, 86690, 95359, 173380, 190718, 381436, 476795, 953590, 1048949, 1907180, 2097898, 4195796, 5244745, 10489490, 20978980]

約数ペア:

[(1, 20978980), (2, 10489490), (4, 5244745), (5, 4195796), (10, 2097898), (11, 1907180), (20, 1048949), (22, 953590), (44, 476795), (55, 381436), (110, 190718), (121, 173380), (220, 95359), (242, 86690), (484, 43345), (605, 34676), (1210, 17338), (2420, 8669)]