20778380

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{193}}^1\times {\mathrm{769}}^1$

素因数の和:978

約数の個数: 48

約数和(自身を含む): 50191680

約数和(自身を除く): 29413300

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 193, 386, 769, 772, 965, 1351, 1538, 1930, 2702, 3076, 3845, 3860, 5383, 5404, 6755, 7690, 10766, 13510, 15380, 21532, 26915, 27020, 53830, 107660, 148417, 296834, 593668, 742085, 1038919, 1484170, 2077838, 2968340, 4155676, 5194595, 10389190, 20778380]

約数ペア:

[(1, 20778380), (2, 10389190), (4, 5194595), (5, 4155676), (7, 2968340), (10, 2077838), (14, 1484170), (20, 1038919), (28, 742085), (35, 593668), (70, 296834), (140, 148417), (193, 107660), (386, 53830), (769, 27020), (772, 26915), (965, 21532), (1351, 15380), (1538, 13510), (1930, 10766), (2702, 7690), (3076, 6755), (3845, 5404), (3860, 5383)]