20937724 has 6 divisors (see below), whose sum is σ = 36641024. Its totient is φ = 10468860.

The previous prime is 20937691. The next prime is 20937733. The reversal of 20937724 is 42773902.

It is a self number, because there is not a number n which added to its sum of digits gives 20937724.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2617212 + ... + 2617219.

Almost surely, 2^20937724 is an apocalyptic number.

It is an amenable number.

20937724 is a deficient number, since it is larger than the sum of its proper divisors (15703300).

20937724 is a wasteful number, since it uses less digits than its factorization.

20937724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5234435 (or 5234433 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 20937724 is about 4575.7757812201. The cubic root of 20937724 is about 275.6194257609.

The spelling of 20937724 in words is "twenty million, nine hundred thirty-seven thousand, seven hundred twenty-four".