20747423 has 2 divisors, whose sum is σ = 20747424. Its totient is φ = 20747422.

The previous prime is 20747399. The next prime is 20747431. The reversal of 20747423 is 32474702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20747423 is a prime.

It is a super-2 number, since 2×20747423² = 860911122281858, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20747473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373711 + 10373712.

It is an arithmetic number, because the mean of its divisors is an integer number (10373712).

Almost surely, 2^20747423 is an apocalyptic number.

20747423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20747423 is an equidigital number, since it uses as much as digits as its factorization.

20747423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 29.

The square root of 20747423 is about 4554.9339182912. The cubic root of 20747423 is about 274.7818567561.

It can be divided in two parts, 2074742 and 3, that multiplied together give a palindrome (6224226).

The spelling of 20747423 in words is "twenty million, seven hundred forty-seven thousand, four hundred twenty-three".