20618832 has 80 divisors (see below), whose sum is σ = 57996288. Its totient is φ = 6274560.

The previous prime is 20618821. The next prime is 20618837. The reversal of 20618832 is 23881602.

It is a self number, because there is not a number n which added to its sum of digits gives 20618832.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107857 + ... + 108047.

Almost surely, 2^20618832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20618832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28998144).

20618832 is an abundant number, since it is smaller than the sum of its proper divisors (37377456).

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

20618832 is a wasteful number, since it uses less digits than its factorization.

20618832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20618832 is about 4540.7964059182. The cubic root of 20618832 is about 274.2129872905.

The spelling of 20618832 in words is "twenty million, six hundred eighteen thousand, eight hundred thirty-two".