20490794 has 4 divisors (see below), whose sum is σ = 30736194. Its totient is φ = 10245396.

The previous prime is 20490787. The next prime is 20490803. The reversal of 20490794 is 49709402.

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

It can be written as a sum of positive squares in only one way, i.e., 13227769 + 7263025 = 3637^2 + 2695^2 .

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, 5122697 + ... + 5122700.

Almost surely, 2^20490794 is an apocalyptic number.

20490794 is a deficient number, since it is larger than the sum of its proper divisors (10245400).

20490794 is a wasteful number, since it uses less digits than its factorization.

20490794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10245399.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20490794 is about 4526.6758222784. The cubic root of 20490794 is about 273.6442093814.

The spelling of 20490794 in words is "twenty million, four hundred ninety thousand, seven hundred ninety-four".