20652749 has 4 divisors (see below), whose sum is σ = 22241436. Its totient is φ = 19064064.

The previous prime is 20652743. The next prime is 20652757. The reversal of 20652749 is 94725602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8970025 + 11682724 = 2995^2 + 3418^2 .

It is a cyclic number.

It is not a de Polignac number, because 20652749 - 2⁸ = 20652493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20652743) 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 in 3 ways as a sum of consecutive naturals, for example, 794324 + ... + 794349.

It is an arithmetic number, because the mean of its divisors is an integer number (5560359).

Almost surely, 2^20652749 is an apocalyptic number.

It is an amenable number.

20652749 is a deficient number, since it is larger than the sum of its proper divisors (1588687).

20652749 is a wasteful number, since it uses less digits than its factorization.

20652749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588686.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20652749 is about 4544.5295686132. The cubic root of 20652749 is about 274.3632607061.

The spelling of 20652749 in words is "twenty million, six hundred fifty-two thousand, seven hundred forty-nine".