20427307 has 4 divisors (see below), whose sum is σ = 20925576. Its totient is φ = 19929040.

The previous prime is 20427287. The next prime is 20427311. The reversal of 20427307 is 70372402.

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 20427307 - 2⁷ = 20427179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20427317) 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, 249073 + ... + 249154.

It is an arithmetic number, because the mean of its divisors is an integer number (5231394).

Almost surely, 2^20427307 is an apocalyptic number.

20427307 is a deficient number, since it is larger than the sum of its proper divisors (498269).

20427307 is an equidigital number, since it uses as much as digits as its factorization.

20427307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498268.

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 20427307 is about 4519.6578410318. The cubic root of 20427307 is about 273.3613047255.

Adding to 20427307 its reverse (70372402), we get a palindrome (90799709).

The spelling of 20427307 in words is "twenty million, four hundred twenty-seven thousand, three hundred seven".