20770823 has 2 divisors, whose sum is σ = 20770824. Its totient is φ = 20770822.

The previous prime is 20770807. The next prime is 20770831. The reversal of 20770823 is 32807702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20770823 - 2⁴ = 20770807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20770423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10385411 + 10385412.

It is an arithmetic number, because the mean of its divisors is an integer number (10385412).

Almost surely, 2^20770823 is an apocalyptic number.

20770823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20770823 is an equidigital number, since it uses as much as digits as its factorization.

20770823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20770823 is about 4557.5018376299. The cubic root of 20770823 is about 274.8851222659.

The spelling of 20770823 in words is "twenty million, seven hundred seventy thousand, eight hundred twenty-three".