21520840

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{59}}^1\times {\mathrm{829}}^1$

素因数の和:910

約数の個数: 64

約数和(自身を含む): 53784000

約数和(自身を除く): 32263160

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 59, 88, 110, 118, 220, 236, 295, 440, 472, 590, 649, 829, 1180, 1298, 1658, 2360, 2596, 3245, 3316, 4145, 5192, 6490, 6632, 8290, 9119, 12980, 16580, 18238, 25960, 33160, 36476, 45595, 48911, 72952, 91190, 97822, 182380, 195644, 244555, 364760, 391288, 489110, 538021, 978220, 1076042, 1956440, 2152084, 2690105, 4304168, 5380210, 10760420, 21520840]

約数ペア:

[(1, 21520840), (2, 10760420), (4, 5380210), (5, 4304168), (8, 2690105), (10, 2152084), (11, 1956440), (20, 1076042), (22, 978220), (40, 538021), (44, 489110), (55, 391288), (59, 364760), (88, 244555), (110, 195644), (118, 182380), (220, 97822), (236, 91190), (295, 72952), (440, 48911), (472, 45595), (590, 36476), (649, 33160), (829, 25960), (1180, 18238), (1298, 16580), (1658, 12980), (2360, 9119), (2596, 8290), (3245, 6632), (3316, 6490), (4145, 5192)]