20752742 has 4 divisors (see below), whose sum is σ = 31129116. Its totient is φ = 10376370.

The previous prime is 20752741. The next prime is 20752763. The reversal of 20752742 is 24725702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24725702 = 2 ⋅12362851.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20752741) 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 as a sum of consecutive naturals, namely, 5188184 + ... + 5188187.

It is an arithmetic number, because the mean of its divisors is an integer number (7782279).

Almost surely, 2^20752742 is an apocalyptic number.

20752742 is a deficient number, since it is larger than the sum of its proper divisors (10376374).

20752742 is a wasteful number, since it uses less digits than its factorization.

20752742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10376373.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 20752742 is about 4555.5177532307. The cubic root of 20752742 is about 274.8053366169.

The spelling of 20752742 in words is "twenty million, seven hundred fifty-two thousand, seven hundred forty-two".