20132878 has 4 divisors (see below), whose sum is σ = 30199320. Its totient is φ = 10066438.

The previous prime is 20132863. The next prime is 20132881. The reversal of 20132878 is 87823102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87823102 = 2 ⋅43911551.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5033218 + ... + 5033221.

It is an arithmetic number, because the mean of its divisors is an integer number (7549830).

Almost surely, 2^20132878 is an apocalyptic number.

20132878 is a deficient number, since it is larger than the sum of its proper divisors (10066442).

20132878 is a wasteful number, since it uses less digits than its factorization.

20132878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10066441.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 20132878 is about 4486.9675728715. The cubic root of 20132878 is about 272.0415792117.

The spelling of 20132878 in words is "twenty million, one hundred thirty-two thousand, eight hundred seventy-eight".