20878994 has 8 divisors (see below), whose sum is σ = 32046960. Its totient is φ = 10196676.

The previous prime is 20878987. The next prime is 20878999. The reversal of 20878994 is 49987802.

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

It is not an unprimeable number, because it can be changed into a prime (20878999) by changing a digit.

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, 121304 + ... + 121475.

It is an arithmetic number, because the mean of its divisors is an integer number (4005870).

Almost surely, 2^20878994 is an apocalyptic number.

20878994 is a deficient number, since it is larger than the sum of its proper divisors (11167966).

20878994 is a wasteful number, since it uses less digits than its factorization.

20878994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242824.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 20878994 is about 4569.3537836329. The cubic root of 20878994 is about 275.3614816566.

The spelling of 20878994 in words is "twenty million, eight hundred seventy-eight thousand, nine hundred ninety-four".