20187427 has 4 divisors (see below), whose sum is σ = 21740320. Its totient is φ = 18634536.

The previous prime is 20187421. The next prime is 20187467. The reversal of 20187427 is 72478102.

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 20187427 - 2¹¹ = 20185379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20187421) 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, 776427 + ... + 776452.

It is an arithmetic number, because the mean of its divisors is an integer number (5435080).

Almost surely, 2^20187427 is an apocalyptic number.

20187427 is a deficient number, since it is larger than the sum of its proper divisors (1552893).

20187427 is a wasteful number, since it uses less digits than its factorization.

20187427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552892.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 20187427 is about 4493.0420652382. The cubic root of 20187427 is about 272.2870518803.

The spelling of 20187427 in words is "twenty million, one hundred eighty-seven thousand, four hundred twenty-seven".