20779773 has 12 divisors (see below), whose sum is σ = 32230080. Its totient is φ = 11874072.

The previous prime is 20779769. The next prime is 20779789. The reversal of 20779773 is 37797702.

It is not a de Polignac number, because 20779773 - 2² = 20779769 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20779723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70533 + ... + 70826.

It is an arithmetic number, because the mean of its divisors is an integer number (2685840).

Almost surely, 2^20779773 is an apocalyptic number.

It is an amenable number.

20779773 is a deficient number, since it is larger than the sum of its proper divisors (11450307).

20779773 is a wasteful number, since it uses less digits than its factorization.

20779773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141376 (or 141369 counting only the distinct ones).

The product of its (nonzero) digits is 129654, while the sum is 42.

The square root of 20779773 is about 4558.4836294540. The cubic root of 20779773 is about 274.9245986116.

The spelling of 20779773 in words is "twenty million, seven hundred seventy-nine thousand, seven hundred seventy-three".