20564142 has 16 divisors (see below), whose sum is σ = 41278032. Its totient is φ = 6829760.

The previous prime is 20564123. The next prime is 20564147. The reversal of 20564142 is 24146502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564147) 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 7 ways as a sum of consecutive naturals, for example, 4413 + ... + 7784.

It is an arithmetic number, because the mean of its divisors is an integer number (2579877).

Almost surely, 2^20564142 is an apocalyptic number.

20564142 is an abundant number, since it is smaller than the sum of its proper divisors (20713890).

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

20564142 is a wasteful number, since it uses less digits than its factorization.

20564142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12483.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20564142 is about 4534.7703359707. The cubic root of 20564142 is about 273.9703290726.

It can be divided in two parts, 20564 and 142, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20564142 in words is "twenty million, five hundred sixty-four thousand, one hundred forty-two".