20881142 has 4 divisors (see below), whose sum is σ = 31321716. Its totient is φ = 10440570.

The previous prime is 20881141. The next prime is 20881163. The reversal of 20881142 is 24118802.

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 (20881141) 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 as a sum of consecutive naturals, namely, 5220284 + ... + 5220287.

It is an arithmetic number, because the mean of its divisors is an integer number (7830429).

Almost surely, 2^20881142 is an apocalyptic number.

20881142 is a deficient number, since it is larger than the sum of its proper divisors (10440574).

20881142 is a wasteful number, since it uses less digits than its factorization.

20881142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10440573.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 20881142 is about 4569.5888217650. The cubic root of 20881142 is about 275.3709242601.

Adding to 20881142 its reverse (24118802), we get a palindrome (44999944).

The spelling of 20881142 in words is "twenty million, eight hundred eighty-one thousand, one hundred forty-two".