20770783 has 4 divisors (see below), whose sum is σ = 22659048. Its totient is φ = 18882520.

The previous prime is 20770777. The next prime is 20770807. The reversal of 20770783 is 38707702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20770783 - 2⁹ = 20770271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20770703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944116 + ... + 944137.

It is an arithmetic number, because the mean of its divisors is an integer number (5664762).

Almost surely, 2^20770783 is an apocalyptic number.

20770783 is a deficient number, since it is larger than the sum of its proper divisors (1888265).

20770783 is a wasteful number, since it uses less digits than its factorization.

20770783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888264.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 20770783 is about 4557.4974492587. The cubic root of 20770783 is about 274.8849458099.

The spelling of 20770783 in words is "twenty million, seven hundred seventy thousand, seven hundred eighty-three".