20327477 has 2 divisors, whose sum is σ = 20327478. Its totient is φ = 20327476.

The previous prime is 20327471. The next prime is 20327479. The reversal of 20327477 is 77472302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12453841 + 7873636 = 3529^2 + 2806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20327477 is a prime.

Together with 20327479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20327471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10163738 + 10163739.

It is an arithmetic number, because the mean of its divisors is an integer number (10163739).

Almost surely, 2^20327477 is an apocalyptic number.

It is an amenable number.

20327477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20327477 is an equidigital number, since it uses as much as digits as its factorization.

20327477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464, while the sum is 32.

The square root of 20327477 is about 4508.6003371335. The cubic root of 20327477 is about 272.9152639466.

Adding to 20327477 its reverse (77472302), we get a palindrome (97799779).

The spelling of 20327477 in words is "twenty million, three hundred twenty-seven thousand, four hundred seventy-seven".