20178142 has 8 divisors (see below), whose sum is σ = 31311000. Its totient is φ = 9741144.

The previous prime is 20178139. The next prime is 20178143. The reversal of 20178142 is 24187102.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20178143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173892 + ... + 174007.

It is an arithmetic number, because the mean of its divisors is an integer number (3913875).

Almost surely, 2^20178142 is an apocalyptic number.

20178142 is a deficient number, since it is larger than the sum of its proper divisors (11132858).

20178142 is a wasteful number, since it uses less digits than its factorization.

20178142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347930.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20178142 is about 4492.0086820931. The cubic root of 20178142 is about 272.2453002663.

The spelling of 20178142 in words is "twenty million, one hundred seventy-eight thousand, one hundred forty-two".