20779704 has 48 divisors (see below), whose sum is σ = 61396920. Its totient is φ = 6296640.

The previous prime is 20779697. The next prime is 20779723. The reversal of 20779704 is 40797702.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12327 + ... + 13910.

Almost surely, 2^20779704 is an apocalyptic number.

20779704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20779704 is an abundant number, since it is smaller than the sum of its proper divisors (40617216).

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

20779704 is a wasteful number, since it uses less digits than its factorization.

20779704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26260 (or 26253 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 20779704 is about 4558.4760611415. The cubic root of 20779704 is about 274.9242943122.

It can be divided in two parts, 2077 and 9704, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 20779704 in words is "twenty million, seven hundred seventy-nine thousand, seven hundred four".