20736623 has 2 divisors, whose sum is σ = 20736624. Its totient is φ = 20736622.

The previous prime is 20736607. The next prime is 20736647. The reversal of 20736623 is 32663702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20736623 - 2⁴ = 20736607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20736673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10368311 + 10368312.

It is an arithmetic number, because the mean of its divisors is an integer number (10368312).

Almost surely, 2^20736623 is an apocalyptic number.

20736623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20736623 is an equidigital number, since it uses as much as digits as its factorization.

20736623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 20736623 is about 4553.7482363433. The cubic root of 20736623 is about 274.7341695625.

The spelling of 20736623 in words is "twenty million, seven hundred thirty-six thousand, six hundred twenty-three".