20720764 has 12 divisors (see below), whose sum is σ = 36600984. Its totient is φ = 10263344.

The previous prime is 20720759. The next prime is 20720767. The reversal of 20720764 is 46702702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720767) 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 3 ways as a sum of consecutive naturals, for example, 23779 + ... + 24634.

It is an arithmetic number, because the mean of its divisors is an integer number (3050082).

Almost surely, 2^20720764 is an apocalyptic number.

It is an amenable number.

20720764 is a deficient number, since it is larger than the sum of its proper divisors (15880220).

20720764 is a wasteful number, since it uses less digits than its factorization.

20720764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48524 (or 48522 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20720764 is about 4552.0065905049. The cubic root of 20720764 is about 274.6641144336.

The spelling of 20720764 in words is "twenty million, seven hundred twenty thousand, seven hundred sixty-four".