20764786 has 32 divisors (see below), whose sum is σ = 38586240. Its totient is φ = 8176896.

The previous prime is 20764781. The next prime is 20764787. The reversal of 20764786 is 68746702.

It is not an unprimeable number, because it can be changed into a prime (20764781) 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, 9220 + ... + 11248.

It is an arithmetic number, because the mean of its divisors is an integer number (1205820).

Almost surely, 2^20764786 is an apocalyptic number.

20764786 is a deficient number, since it is larger than the sum of its proper divisors (17821454).

20764786 is a wasteful number, since it uses less digits than its factorization.

20764786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 20764786 is about 4556.8394748992. The cubic root of 20764786 is about 274.8584880736.

The spelling of 20764786 in words is "twenty million, seven hundred sixty-four thousand, seven hundred eighty-six".