20427263 has 4 divisors (see below), whose sum is σ = 20618280. Its totient is φ = 20236248.

The previous prime is 20427257. The next prime is 20427271. The reversal of 20427263 is 36272402.

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 20427263 - 2⁴ = 20427247 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 (20427283) 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, 95348 + ... + 95561.

It is an arithmetic number, because the mean of its divisors is an integer number (5154570).

Almost surely, 2^20427263 is an apocalyptic number.

20427263 is a deficient number, since it is larger than the sum of its proper divisors (191017).

20427263 is a wasteful number, since it uses less digits than its factorization.

20427263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191016.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20427263 is about 4519.6529734040. The cubic root of 20427263 is about 273.3611084539.

Adding to 20427263 its reverse (36272402), we get a palindrome (56699665).

The spelling of 20427263 in words is "twenty million, four hundred twenty-seven thousand, two hundred sixty-three".