20142647 has 8 divisors (see below), whose sum is σ = 23050752. Its totient is φ = 17242200.

The previous prime is 20142613. The next prime is 20142673. The reversal of 20142647 is 74624102.

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

It is a cyclic number.

It is not a de Polignac number, because 20142647 - 2⁶ = 20142583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20142047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5822 + ... + 8612.

It is an arithmetic number, because the mean of its divisors is an integer number (2881344).

Almost surely, 2^20142647 is an apocalyptic number.

20142647 is a deficient number, since it is larger than the sum of its proper divisors (2908105).

20142647 is a wasteful number, since it uses less digits than its factorization.

20142647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20142647 is about 4488.0560379746. The cubic root of 20142647 is about 272.0855726647.

Adding to 20142647 its reverse (74624102), we get a palindrome (94766749).

The spelling of 20142647 in words is "twenty million, one hundred forty-two thousand, six hundred forty-seven".