20728776 has 32 divisors (see below), whose sum is σ = 52675200. Its totient is φ = 6795840.

The previous prime is 20728759. The next prime is 20728781. The reversal of 20728776 is 67782702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5616 + ... + 8543.

It is an arithmetic number, because the mean of its divisors is an integer number (1646100).

Almost surely, 2^20728776 is an apocalyptic number.

It is an amenable number.

20728776 is an abundant number, since it is smaller than the sum of its proper divisors (31946424).

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

20728776 is a wasteful number, since it uses less digits than its factorization.

20728776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14229 (or 14225 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 20728776 is about 4552.8865568999. The cubic root of 20728776 is about 274.6995108973.

The spelling of 20728776 in words is "twenty million, seven hundred twenty-eight thousand, seven hundred seventy-six".