20724772 has 12 divisors (see below), whose sum is σ = 36346240. Its totient is φ = 10340136.

The previous prime is 20724731. The next prime is 20724793. The reversal of 20724772 is 27742702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3372 + ... + 7267.

Almost surely, 2^20724772 is an apocalyptic number.

It is an amenable number.

20724772 is a deficient number, since it is larger than the sum of its proper divisors (15621468).

20724772 is a wasteful number, since it uses less digits than its factorization.

20724772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130 (or 11128 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 20724772 is about 4552.4468146262. The cubic root of 20724772 is about 274.6818226417.

The spelling of 20724772 in words is "twenty million, seven hundred twenty-four thousand, seven hundred seventy-two".