20500188 has 24 divisors (see below), whose sum is σ = 48737808. Its totient is φ = 6704256.

The previous prime is 20500169. The next prime is 20500189. The reversal of 20500188 is 88100502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500189) 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, 15481 + ... + 16752.

It is an arithmetic number, because the mean of its divisors is an integer number (2030742).

Almost surely, 2^20500188 is an apocalyptic number.

It is an amenable number.

20500188 is an abundant number, since it is smaller than the sum of its proper divisors (28237620).

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

20500188 is a wasteful number, since it uses less digits than its factorization.

20500188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32293 (or 32291 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 20500188 is about 4527.7133301480. The cubic root of 20500188 is about 273.6860203685.

The spelling of 20500188 in words is "twenty million, five hundred thousand, one hundred eighty-eight".