20744623 has 2 divisors, whose sum is σ = 20744624. Its totient is φ = 20744622.

The previous prime is 20744621. The next prime is 20744627. The reversal of 20744623 is 32644702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20744623 - 2¹ = 20744621 is a prime.

Together with 20744621, it forms a pair of twin primes.

It is equal to p_1314838 and since 20744623 and 1314838 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20744591 and 20744600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20744621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10372311 + 10372312.

It is an arithmetic number, because the mean of its divisors is an integer number (10372312).

Almost surely, 2^20744623 is an apocalyptic number.

20744623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20744623 is an equidigital number, since it uses as much as digits as its factorization.

20744623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 20744623 is about 4554.6265489061. The cubic root of 20744623 is about 274.7694949990.

The spelling of 20744623 in words is "twenty million, seven hundred forty-four thousand, six hundred twenty-three".