20779228 has 6 divisors (see below), whose sum is σ = 36363656. Its totient is φ = 10389612.

The previous prime is 20779193. The next prime is 20779247. The reversal of 20779228 is 82297702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2597400 + ... + 2597407.

Almost surely, 2^20779228 is an apocalyptic number.

It is an amenable number.

20779228 is a deficient number, since it is larger than the sum of its proper divisors (15584428).

20779228 is a wasteful number, since it uses less digits than its factorization.

20779228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5194811 (or 5194809 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20779228 is about 4558.4238504115. The cubic root of 20779228 is about 274.9221950688.

The spelling of 20779228 in words is "twenty million, seven hundred seventy-nine thousand, two hundred twenty-eight".