21492471

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{421}}^1$

素因数の和:472

約数の個数: 64

約数和(自身を含む): 40836096

約数和(自身を除く): 19343625

約数列:

[1, 3, 7, 11, 13, 17, 21, 33, 39, 51, 77, 91, 119, 143, 187, 221, 231, 273, 357, 421, 429, 561, 663, 1001, 1263, 1309, 1547, 2431, 2947, 3003, 3927, 4631, 4641, 5473, 7157, 7293, 8841, 13893, 16419, 17017, 21471, 32417, 38311, 50099, 51051, 60203, 78727, 93041, 97251, 114933, 150297, 180609, 236181, 279123, 421421, 551089, 651287, 1023451, 1264263, 1653267, 1953861, 3070353, 7164157, 21492471]

約数ペア:

[(1, 21492471), (3, 7164157), (7, 3070353), (11, 1953861), (13, 1653267), (17, 1264263), (21, 1023451), (33, 651287), (39, 551089), (51, 421421), (77, 279123), (91, 236181), (119, 180609), (143, 150297), (187, 114933), (221, 97251), (231, 93041), (273, 78727), (357, 60203), (421, 51051), (429, 50099), (561, 38311), (663, 32417), (1001, 21471), (1263, 17017), (1309, 16419), (1547, 13893), (2431, 8841), (2947, 7293), (3003, 7157), (3927, 5473), (4631, 4641)]