20131288 has 8 divisors (see below), whose sum is σ = 37746180. Its totient is φ = 10065640.

The previous prime is 20131277. The next prime is 20131291. The reversal of 20131288 is 88213102.

20131288 is nontrivially palindromic in base 14.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258198 + ... + 1258213.

Almost surely, 2^20131288 is an apocalyptic number.

It is an amenable number.

20131288 is a deficient number, since it is larger than the sum of its proper divisors (17614892).

20131288 is a wasteful number, since it uses less digits than its factorization.

20131288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516417 (or 2516413 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20131288 is about 4486.7903895769. The cubic root of 20131288 is about 272.0344175018.

The spelling of 20131288 in words is "twenty million, one hundred thirty-one thousand, two hundred eighty-eight".