20494079 has 4 divisors (see below), whose sum is σ = 20782800. Its totient is φ = 20205360.

The previous prime is 20494051. The next prime is 20494139. The reversal of 20494079 is 97049402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97049402 = 2 ⋅48524701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20494079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20494049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144254 + ... + 144395.

It is an arithmetic number, because the mean of its divisors is an integer number (5195700).

Almost surely, 2^20494079 is an apocalyptic number.

20494079 is a deficient number, since it is larger than the sum of its proper divisors (288721).

20494079 is an equidigital number, since it uses as much as digits as its factorization.

20494079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288720.

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

The square root of 20494079 is about 4527.0386567822. The cubic root of 20494079 is about 273.6588317722.

The spelling of 20494079 in words is "twenty million, four hundred ninety-four thousand, seventy-nine".