20747399 has 2 divisors, whose sum is σ = 20747400. Its totient is φ = 20747398.

The previous prime is 20747347. The next prime is 20747423. The reversal of 20747399 is 99374702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20747399 - 2²⁰ = 19698823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20747299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373699 + 10373700.

It is an arithmetic number, because the mean of its divisors is an integer number (10373700).

Almost surely, 2^20747399 is an apocalyptic number.

20747399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20747399 is an equidigital number, since it uses as much as digits as its factorization.

20747399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 20747399 is about 4554.9312837846. The cubic root of 20747399 is about 274.7817508029.

The spelling of 20747399 in words is "twenty million, seven hundred forty-seven thousand, three hundred ninety-nine".