20494142 has 4 divisors (see below), whose sum is σ = 30741216. Its totient is φ = 10247070.

The previous prime is 20494139. The next prime is 20494147. The reversal of 20494142 is 24149402.

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 (20494147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5123534 + ... + 5123537.

It is an arithmetic number, because the mean of its divisors is an integer number (7685304).

Almost surely, 2^20494142 is an apocalyptic number.

20494142 is a deficient number, since it is larger than the sum of its proper divisors (10247074).

20494142 is a wasteful number, since it uses less digits than its factorization.

20494142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10247073.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20494142 is about 4527.0456149679. The cubic root of 20494142 is about 273.6591121864.

The spelling of 20494142 in words is "twenty million, four hundred ninety-four thousand, one hundred forty-two".