20770779 has 4 divisors (see below), whose sum is σ = 27694376. Its totient is φ = 13847184.

The previous prime is 20770777. The next prime is 20770807. The reversal of 20770779 is 97707702.

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

It is not a de Polignac number, because 20770779 - 2¹ = 20770777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20770777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3461794 + ... + 3461799.

It is an arithmetic number, because the mean of its divisors is an integer number (6923594).

Almost surely, 2^20770779 is an apocalyptic number.

20770779 is a deficient number, since it is larger than the sum of its proper divisors (6923597).

20770779 is an equidigital number, since it uses as much as digits as its factorization.

20770779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6923596.

The product of its (nonzero) digits is 43218, while the sum is 39.

The square root of 20770779 is about 4557.4970104214. The cubic root of 20770779 is about 274.8849281642.

The spelling of 20770779 in words is "twenty million, seven hundred seventy thousand, seven hundred seventy-nine".