20670764 has 6 divisors (see below), whose sum is σ = 36173844. Its totient is φ = 10335380.

The previous prime is 20670763. The next prime is 20670817. The reversal of 20670764 is 46707602.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20670764.

It is not an unprimeable number, because it can be changed into a prime (20670763) 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 as a sum of consecutive naturals, namely, 2583842 + ... + 2583849.

It is an arithmetic number, because the mean of its divisors is an integer number (6028974).

Almost surely, 2^20670764 is an apocalyptic number.

It is an amenable number.

20670764 is a deficient number, since it is larger than the sum of its proper divisors (15503080).

20670764 is a wasteful number, since it uses less digits than its factorization.

20670764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5167695 (or 5167693 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 20670764 is about 4546.5111899125. The cubic root of 20670764 is about 274.4430114729.

The spelling of 20670764 in words is "twenty million, six hundred seventy thousand, seven hundred sixty-four".