20031427 has 4 divisors (see below), whose sum is σ = 21572320. Its totient is φ = 18490536.

The previous prime is 20031409. The next prime is 20031439. The reversal of 20031427 is 72413002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72413002 = 2 ⋅36206501.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20031427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770427 + ... + 770452.

It is an arithmetic number, because the mean of its divisors is an integer number (5393080).

Almost surely, 2^20031427 is an apocalyptic number.

20031427 is a deficient number, since it is larger than the sum of its proper divisors (1540893).

20031427 is a wasteful number, since it uses less digits than its factorization.

20031427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540892.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20031427 is about 4475.6482212077. The cubic root of 20031427 is about 271.5838639254.

Adding to 20031427 its reverse (72413002), we get a palindrome (92444429).

The spelling of 20031427 in words is "twenty million, thirty-one thousand, four hundred twenty-seven".