20736789 has 16 divisors (see below), whose sum is σ = 28492800. Its totient is φ = 13409136.

The previous prime is 20736773. The next prime is 20736791. The reversal of 20736789 is 98763702.

It is not a de Polignac number, because 20736789 - 2⁴ = 20736773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20736789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13242 + ... + 14724.

It is an arithmetic number, because the mean of its divisors is an integer number (1780800).

Almost surely, 2^20736789 is an apocalyptic number.

It is an amenable number.

20736789 is a deficient number, since it is larger than the sum of its proper divisors (7756011).

20736789 is a wasteful number, since it uses less digits than its factorization.

20736789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 20736789 is about 4553.7664630501. The cubic root of 20736789 is about 274.7349026576.

The spelling of 20736789 in words is "twenty million, seven hundred thirty-six thousand, seven hundred eighty-nine".