20780980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{59}}^1\times {\mathrm{1601}}^1$

素因数の和:1680

約数の個数: 48

約数和(自身を含む): 48444480

約数和(自身を除く): 27663500

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 59, 110, 118, 220, 236, 295, 590, 649, 1180, 1298, 1601, 2596, 3202, 3245, 6404, 6490, 8005, 12980, 16010, 17611, 32020, 35222, 70444, 88055, 94459, 176110, 188918, 352220, 377836, 472295, 944590, 1039049, 1889180, 2078098, 4156196, 5195245, 10390490, 20780980]

約数ペア:

[(1, 20780980), (2, 10390490), (4, 5195245), (5, 4156196), (10, 2078098), (11, 1889180), (20, 1039049), (22, 944590), (44, 472295), (55, 377836), (59, 352220), (110, 188918), (118, 176110), (220, 94459), (236, 88055), (295, 70444), (590, 35222), (649, 32020), (1180, 17611), (1298, 16010), (1601, 12980), (2596, 8005), (3202, 6490), (3245, 6404)]