20451142 has 4 divisors (see below), whose sum is σ = 30676716. Its totient is φ = 10225570.

The previous prime is 20451131. The next prime is 20451181. The reversal of 20451142 is 24115402.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5112784 + ... + 5112787.

It is an arithmetic number, because the mean of its divisors is an integer number (7669179).

Almost surely, 2^20451142 is an apocalyptic number.

20451142 is a deficient number, since it is larger than the sum of its proper divisors (10225574).

20451142 is a wasteful number, since it uses less digits than its factorization.

20451142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10225573.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20451142 is about 4522.2938869560. The cubic root of 20451142 is about 273.4675845886.

Adding to 20451142 its reverse (24115402), we get a palindrome (44566544).

The spelling of 20451142 in words is "twenty million, four hundred fifty-one thousand, one hundred forty-two".