20196981

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{359}}^1$

素因数の和:438

約数の個数: 48

約数和(自身を含む): 35942400

約数和(自身を除く): 15745419

約数列:

[1, 3, 7, 9, 19, 21, 47, 57, 63, 133, 141, 171, 329, 359, 399, 423, 893, 987, 1077, 1197, 2513, 2679, 2961, 3231, 6251, 6821, 7539, 8037, 16873, 18753, 20463, 22617, 47747, 50619, 56259, 61389, 118111, 143241, 151857, 320587, 354333, 429723, 961761, 1062999, 2244109, 2885283, 6732327, 20196981]

約数ペア:

[(1, 20196981), (3, 6732327), (7, 2885283), (9, 2244109), (19, 1062999), (21, 961761), (47, 429723), (57, 354333), (63, 320587), (133, 151857), (141, 143241), (171, 118111), (329, 61389), (359, 56259), (399, 50619), (423, 47747), (893, 22617), (987, 20463), (1077, 18753), (1197, 16873), (2513, 8037), (2679, 7539), (2961, 6821), (3231, 6251)]