20855742 has 16 divisors (see below), whose sum is σ = 42215040. Its totient is φ = 6867992.

The previous prime is 20855701. The next prime is 20855743. The reversal of 20855742 is 24755802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20442 + ... + 21437.

It is an arithmetic number, because the mean of its divisors is an integer number (2638440).

Almost surely, 2^20855742 is an apocalyptic number.

20855742 is an abundant number, since it is smaller than the sum of its proper divisors (21359298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20855742 is a wasteful number, since it uses less digits than its factorization.

20855742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41967.

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 20855742 is about 4566.8087325834. The cubic root of 20855742 is about 275.2592244399.

The spelling of 20855742 in words is "twenty million, eight hundred fifty-five thousand, seven hundred forty-two".