21087729

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{823}}^1$

素因数の和:918

約数の個数: 32

約数和(自身を含む): 34146560

約数和(自身を除く): 13058831

約数列:

[1, 3, 9, 13, 27, 39, 73, 117, 219, 351, 657, 823, 949, 1971, 2469, 2847, 7407, 8541, 10699, 22221, 25623, 32097, 60079, 96291, 180237, 288873, 540711, 781027, 1622133, 2343081, 7029243, 21087729]

約数ペア:

[(1, 21087729), (3, 7029243), (9, 2343081), (13, 1622133), (27, 781027), (39, 540711), (73, 288873), (117, 180237), (219, 96291), (351, 60079), (657, 32097), (823, 25623), (949, 22221), (1971, 10699), (2469, 8541), (2847, 7407)]