20512442 has 8 divisors (see below), whose sum is σ = 30798036. Its totient is φ = 10246432.

The previous prime is 20512439. The next prime is 20512447. The reversal of 20512442 is 24421502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20241001 + 271441 = 4499^2 + 521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20512447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1913 + ... + 6684.

Almost surely, 2^20512442 is an apocalyptic number.

20512442 is a deficient number, since it is larger than the sum of its proper divisors (10285594).

20512442 is a wasteful number, since it uses less digits than its factorization.

20512442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9792.

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

The square root of 20512442 is about 4529.0663497017. The cubic root of 20512442 is about 273.7405415023.

Adding to 20512442 its reverse (24421502), we get a palindrome (44933944).

The spelling of 20512442 in words is "twenty million, five hundred twelve thousand, four hundred forty-two".