20732779 has 2 divisors, whose sum is σ = 20732780. Its totient is φ = 20732778.

The previous prime is 20732773. The next prime is 20732783. The reversal of 20732779 is 97723702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20732779 - 2³ = 20732771 is a prime.

It is not a weakly prime, because it can be changed into another prime (20732771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10366389 + 10366390.

It is an arithmetic number, because the mean of its divisors is an integer number (10366390).

Almost surely, 2^20732779 is an apocalyptic number.

20732779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20732779 is an equidigital number, since it uses as much as digits as its factorization.

20732779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 20732779 is about 4553.3261468953. The cubic root of 20732779 is about 274.7171924585.

The spelling of 20732779 in words is "twenty million, seven hundred thirty-two thousand, seven hundred seventy-nine".