20131867 has 8 divisors (see below), whose sum is σ = 23323616. Its totient is φ = 17019072.

The previous prime is 20131819. The next prime is 20131871. The reversal of 20131867 is 76813102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20131867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19188 + ... + 20209.

It is an arithmetic number, because the mean of its divisors is an integer number (2915452).

Almost surely, 2^20131867 is an apocalyptic number.

20131867 is a deficient number, since it is larger than the sum of its proper divisors (3191749).

20131867 is an equidigital number, since it uses as much as digits as its factorization.

20131867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39477.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 20131867 is about 4486.8549118508. The cubic root of 20131867 is about 272.0370254889.

Adding to 20131867 its reverse (76813102), we get a palindrome (96944969).

The spelling of 20131867 in words is "twenty million, one hundred thirty-one thousand, eight hundred sixty-seven".