20563142 has 4 divisors (see below), whose sum is σ = 30844716. Its totient is φ = 10281570.

The previous prime is 20563141. The next prime is 20563163. The reversal of 20563142 is 24136502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5140784 + ... + 5140787.

It is an arithmetic number, because the mean of its divisors is an integer number (7711179).

Almost surely, 2^20563142 is an apocalyptic number.

20563142 is a deficient number, since it is larger than the sum of its proper divisors (10281574).

20563142 is a wasteful number, since it uses less digits than its factorization.

20563142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10281573.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20563142 is about 4534.6600754632. The cubic root of 20563142 is about 273.9658880936.

Adding to 20563142 its reverse (24136502), we get a palindrome (44699644).

The spelling of 20563142 in words is "twenty million, five hundred sixty-three thousand, one hundred forty-two".