20631427 has 4 divisors (see below), whose sum is σ = 20814120. Its totient is φ = 20448736.

The previous prime is 20631409. The next prime is 20631433. The reversal of 20631427 is 72413602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20631427 - 2¹⁵ = 20598659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20631407) 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, 91177 + ... + 91402.

It is an arithmetic number, because the mean of its divisors is an integer number (5203530).

Almost surely, 2^20631427 is an apocalyptic number.

20631427 is a deficient number, since it is larger than the sum of its proper divisors (182693).

20631427 is a wasteful number, since it uses less digits than its factorization.

20631427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182692.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20631427 is about 4542.1830654433. The cubic root of 20631427 is about 274.2688102001.

The spelling of 20631427 in words is "twenty million, six hundred thirty-one thousand, four hundred twenty-seven".