20131884 has 18 divisors (see below), whose sum is σ = 50889020. Its totient is φ = 6710616.

The previous prime is 20131883. The next prime is 20131907. The reversal of 20131884 is 48813102.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (20131883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279574 + ... + 279645.

Almost surely, 2^20131884 is an apocalyptic number.

It is an amenable number.

20131884 is an abundant number, since it is smaller than the sum of its proper divisors (30757136).

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

20131884 is a wasteful number, since it uses less digits than its factorization.

20131884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559229 (or 559224 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20131884 is about 4486.8568062732. The cubic root of 20131884 is about 272.0371020611.

Adding to 20131884 its reverse (48813102), we get a palindrome (68944986).

The spelling of 20131884 in words is "twenty million, one hundred thirty-one thousand, eight hundred eighty-four".