20452142 has 4 divisors (see below), whose sum is σ = 30678216. Its totient is φ = 10226070.

The previous prime is 20452123. The next prime is 20452147. The reversal of 20452142 is 24125402.

It is a happy number.

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

It is a super-2 number, since 2×20452142² = 836580224776328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20452147) by changing a digit.

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, 5113034 + ... + 5113037.

It is an arithmetic number, because the mean of its divisors is an integer number (7669554).

Almost surely, 2^20452142 is an apocalyptic number.

20452142 is a deficient number, since it is larger than the sum of its proper divisors (10226074).

20452142 is a wasteful number, since it uses less digits than its factorization.

20452142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10226073.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20452142 is about 4522.4044489630. The cubic root of 20452142 is about 273.4720417664.

Adding to 20452142 its reverse (24125402), we get a palindrome (44577544).

The spelling of 20452142 in words is "twenty million, four hundred fifty-two thousand, one hundred forty-two".