21396760

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{6947}}^1$

素因数の和:6976

約数の個数: 64

約数和(自身を含む): 60030720

約数和(自身を除く): 38633960

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 14, 20, 22, 28, 35, 40, 44, 55, 56, 70, 77, 88, 110, 140, 154, 220, 280, 308, 385, 440, 616, 770, 1540, 3080, 6947, 13894, 27788, 34735, 48629, 55576, 69470, 76417, 97258, 138940, 152834, 194516, 243145, 277880, 305668, 382085, 389032, 486290, 534919, 611336, 764170, 972580, 1069838, 1528340, 1945160, 2139676, 2674595, 3056680, 4279352, 5349190, 10698380, 21396760]

約数ペア:

[(1, 21396760), (2, 10698380), (4, 5349190), (5, 4279352), (7, 3056680), (8, 2674595), (10, 2139676), (11, 1945160), (14, 1528340), (20, 1069838), (22, 972580), (28, 764170), (35, 611336), (40, 534919), (44, 486290), (55, 389032), (56, 382085), (70, 305668), (77, 277880), (88, 243145), (110, 194516), (140, 152834), (154, 138940), (220, 97258), (280, 76417), (308, 69470), (385, 55576), (440, 48629), (616, 34735), (770, 27788), (1540, 13894), (3080, 6947)]