21230860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{1091}}^1$

素因数の和:1246

約数の個数: 48

約数和(自身を含む): 51367680

約数和(自身を除く): 30136820

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 139, 140, 278, 556, 695, 973, 1091, 1390, 1946, 2182, 2780, 3892, 4364, 4865, 5455, 7637, 9730, 10910, 15274, 19460, 21820, 30548, 38185, 76370, 151649, 152740, 303298, 606596, 758245, 1061543, 1516490, 2123086, 3032980, 4246172, 5307715, 10615430, 21230860]

約数ペア:

[(1, 21230860), (2, 10615430), (4, 5307715), (5, 4246172), (7, 3032980), (10, 2123086), (14, 1516490), (20, 1061543), (28, 758245), (35, 606596), (70, 303298), (139, 152740), (140, 151649), (278, 76370), (556, 38185), (695, 30548), (973, 21820), (1091, 19460), (1390, 15274), (1946, 10910), (2182, 9730), (2780, 7637), (3892, 5455), (4364, 4865)]