20728038 has 8 divisors (see below), whose sum is σ = 41456088. Its totient is φ = 6909344.

The previous prime is 20728033. The next prime is 20728061. The reversal of 20728038 is 83082702.

It is a sphenic number, since it is the product of 3 distinct primes.

20728038 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20727996 and 20728014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1727331 + ... + 1727342.

It is an arithmetic number, because the mean of its divisors is an integer number (5182011).

Almost surely, 2^20728038 is an apocalyptic number.

20728038 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20728038 is a wasteful number, since it uses less digits than its factorization.

20728038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454678.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20728038 is about 4552.8055086946. The cubic root of 20728038 is about 274.6962508456.

The spelling of 20728038 in words is "twenty million, seven hundred twenty-eight thousand, thirty-eight".