20779788 has 24 divisors (see below), whose sum is σ = 48686400. Its totient is φ = 6898000.

The previous prime is 20779769. The next prime is 20779789. The reversal of 20779788 is 88797702.

It is not an unprimeable number, because it can be changed into a prime (20779789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (2028600).

Almost surely, 2^20779788 is an apocalyptic number.

It is an amenable number.

20779788 is an abundant number, since it is smaller than the sum of its proper divisors (27906612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20779788 is a wasteful number, since it uses less digits than its factorization.

20779788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7157 (or 7155 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 48.

The square root of 20779788 is about 4558.4852747377. The cubic root of 20779788 is about 274.9246647635.

The spelling of 20779788 in words is "twenty million, seven hundred seventy-nine thousand, seven hundred eighty-eight".