20773128 has 32 divisors (see below), whose sum is σ = 53143200. Its totient is φ = 6763008.

The previous prime is 20773127. The next prime is 20773139. The reversal of 20773128 is 82137702.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20773095 and 20773104.

It is not an unprimeable number, because it can be changed into a prime (20773127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9033 + ... + 11096.

It is an arithmetic number, because the mean of its divisors is an integer number (1660725).

Almost surely, 2^20773128 is an apocalyptic number.

It is an amenable number.

20773128 is an abundant number, since it is smaller than the sum of its proper divisors (32370072).

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

20773128 is a wasteful number, since it uses less digits than its factorization.

20773128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20181 (or 20177 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 20773128 is about 4557.7547103810. The cubic root of 20773128 is about 274.8952901630.

The spelling of 20773128 in words is "twenty million, seven hundred seventy-three thousand, one hundred twenty-eight".