20543878 has 8 divisors (see below), whose sum is σ = 30853368. Its totient is φ = 10259424.

The previous prime is 20543869. The next prime is 20543881. The reversal of 20543878 is 87834502.

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

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 in 3 ways as a sum of consecutive naturals, for example, 4051 + ... + 7582.

It is an arithmetic number, because the mean of its divisors is an integer number (3856671).

Almost surely, 2^20543878 is an apocalyptic number.

20543878 is a deficient number, since it is larger than the sum of its proper divisors (10309490).

20543878 is a wasteful number, since it uses less digits than its factorization.

20543878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12518.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 20543878 is about 4532.5354935179. The cubic root of 20543878 is about 273.8803089571.

The spelling of 20543878 in words is "twenty million, five hundred forty-three thousand, eight hundred seventy-eight".