20724766 has 4 divisors (see below), whose sum is σ = 31087152. Its totient is φ = 10362382.

The previous prime is 20724731. The next prime is 20724793. The reversal of 20724766 is 66742702.

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

It is a congruent number.

It is an unprimeable number.

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, 5181190 + ... + 5181193.

It is an arithmetic number, because the mean of its divisors is an integer number (7771788).

Almost surely, 2^20724766 is an apocalyptic number.

20724766 is a deficient number, since it is larger than the sum of its proper divisors (10362386).

20724766 is a wasteful number, since it uses less digits than its factorization.

20724766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10362385.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 20724766 is about 4552.4461556398. The cubic root of 20724766 is about 274.6817961341.

The spelling of 20724766 in words is "twenty million, seven hundred twenty-four thousand, seven hundred sixty-six".