20868142 has 8 divisors (see below), whose sum is σ = 31345632. Its totient is φ = 10419600.

The previous prime is 20868131. The next prime is 20868149. The reversal of 20868142 is 24186802.

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 (20868149) 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, 5334 + ... + 8377.

It is an arithmetic number, because the mean of its divisors is an integer number (3918204).

Almost surely, 2^20868142 is an apocalyptic number.

20868142 is a deficient number, since it is larger than the sum of its proper divisors (10477490).

20868142 is a wasteful number, since it uses less digits than its factorization.

20868142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14474.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 20868142 is about 4568.1661528451. The cubic root of 20868142 is about 275.3137663841.

The spelling of 20868142 in words is "twenty million, eight hundred sixty-eight thousand, one hundred forty-two".