21075903

素因数分解:

$3^3\times {\mathrm{17}}^2\times {\mathrm{37}}^1\times {\mathrm{73}}^1$

素因数の和:153

約数の個数: 48

約数和(自身を含む): 34531360

約数和(自身を除く): 13455457

約数列:

[1, 3, 9, 17, 27, 37, 51, 73, 111, 153, 219, 289, 333, 459, 629, 657, 867, 999, 1241, 1887, 1971, 2601, 2701, 3723, 5661, 7803, 8103, 10693, 11169, 16983, 21097, 24309, 32079, 33507, 45917, 63291, 72927, 96237, 137751, 189873, 288711, 413253, 569619, 780589, 1239759, 2341767, 7025301, 21075903]

約数ペア:

[(1, 21075903), (3, 7025301), (9, 2341767), (17, 1239759), (27, 780589), (37, 569619), (51, 413253), (73, 288711), (111, 189873), (153, 137751), (219, 96237), (289, 72927), (333, 63291), (459, 45917), (629, 33507), (657, 32079), (867, 24309), (999, 21097), (1241, 16983), (1887, 11169), (1971, 10693), (2601, 8103), (2701, 7803), (3723, 5661)]