20839128 has 32 divisors (see below), whose sum is σ = 52619760. Its totient is φ = 6876800.

The previous prime is 20839109. The next prime is 20839129. The reversal of 20839128 is 82193802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839129) 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, 1875 + ... + 6722.

Almost surely, 2^20839128 is an apocalyptic number.

It is an amenable number.

20839128 is an abundant number, since it is smaller than the sum of its proper divisors (31780632).

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

20839128 is a wasteful number, since it uses less digits than its factorization.

20839128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8707 (or 8703 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 20839128 is about 4564.9893756722. The cubic root of 20839128 is about 275.1861131333.

It can be divided in two parts, 2083 and 9128, that added together give a palindrome (11211).

The spelling of 20839128 in words is "twenty million, eight hundred thirty-nine thousand, one hundred twenty-eight".