20838932728 has 16 divisors (see below), whose sum is σ = 39713540760. Its totient is φ = 10248655200.

The previous prime is 20838932713. The next prime is 20838932729. The reversal of 20838932728 is 82723983802.

It is a super-2 number, since 2×20838932728² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20838932729) 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, 21350878 + ... + 21351853.

Almost surely, 2^20838932728 is an apocalyptic number.

It is an amenable number.

20838932728 is a deficient number, since it is larger than the sum of its proper divisors (18874608032).

20838932728 is a wasteful number, since it uses less digits than its factorization.

20838932728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42702798 (or 42702794 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 20838932728 in words is "twenty billion, eight hundred thirty-eight million, nine hundred thirty-two thousand, seven hundred twenty-eight".