20427293 has 4 divisors (see below), whose sum is σ = 20979420. Its totient is φ = 19875168.

The previous prime is 20427287. The next prime is 20427311. The reversal of 20427293 is 39272402.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19123129 + 1304164 = 4373^2 + 1142^2 .

It is a cyclic number.

It is not a de Polignac number, because 20427293 - 2⁶ = 20427229 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, 276008 + ... + 276081.

It is an arithmetic number, because the mean of its divisors is an integer number (5244855).

Almost surely, 2^20427293 is an apocalyptic number.

It is an amenable number.

20427293 is a deficient number, since it is larger than the sum of its proper divisors (552127).

20427293 is an equidigital number, since it uses as much as digits as its factorization.

20427293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552126.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20427293 is about 4519.6562922417. The cubic root of 20427293 is about 273.3612422755.

Adding to 20427293 its reverse (39272402), we get a palindrome (59699695).

The spelling of 20427293 in words is "twenty million, four hundred twenty-seven thousand, two hundred ninety-three".