20764306 has 4 divisors (see below), whose sum is σ = 31146462. Its totient is φ = 10382152.

The previous prime is 20764301. The next prime is 20764307. The reversal of 20764306 is 60346702.

20764306 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 1798281 = 4355^2 + 1341^2 .

It is not an unprimeable number, because it can be changed into a prime (20764301) 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, 5191075 + ... + 5191078.

Almost surely, 2^20764306 is an apocalyptic number.

20764306 is a deficient number, since it is larger than the sum of its proper divisors (10382156).

20764306 is a wasteful number, since it uses less digits than its factorization.

20764306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10382155.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 20764306 is about 4556.7868065118. The cubic root of 20764306 is about 274.8563701757.

The spelling of 20764306 in words is "twenty million, seven hundred sixty-four thousand, three hundred six".