20494789 has 24 divisors (see below), whose sum is σ = 24919488. Its totient is φ = 16793280.

The previous prime is 20494783. The next prime is 20494807. The reversal of 20494789 is 98749402.

It is not a de Polignac number, because 20494789 - 2⁵ = 20494757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20494783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149529 + ... + 149665.

It is an arithmetic number, because the mean of its divisors is an integer number (1038312).

Almost surely, 2^20494789 is an apocalyptic number.

It is an amenable number.

20494789 is a deficient number, since it is larger than the sum of its proper divisors (4424699).

20494789 is a wasteful number, since it uses less digits than its factorization.

20494789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20494789 is about 4527.1170738120. The cubic root of 20494789 is about 273.6619919618.

The spelling of 20494789 in words is "twenty million, four hundred ninety-four thousand, seven hundred eighty-nine".