20545724 has 12 divisors (see below), whose sum is σ = 38070144. Its totient is φ = 9668544.

The previous prime is 20545711. The next prime is 20545769. The reversal of 20545724 is 42754502.

It is a happy number.

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, 151004 + ... + 151139.

It is an arithmetic number, because the mean of its divisors is an integer number (3172512).

Almost surely, 2^20545724 is an apocalyptic number.

It is an amenable number.

20545724 is a deficient number, since it is larger than the sum of its proper divisors (17524420).

20545724 is a wasteful number, since it uses less digits than its factorization.

20545724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302164 (or 302162 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 20545724 is about 4532.7391277240. The cubic root of 20545724 is about 273.8885120157. Note that the first 3 decimals are identical.

The spelling of 20545724 in words is "twenty million, five hundred forty-five thousand, seven hundred twenty-four".