20499790 has 16 divisors (see below), whose sum is σ = 39070512. Its totient is φ = 7717504.

The previous prime is 20499779. The next prime is 20499799. The reversal of 20499790 is 9799402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20499799) 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 7 ways as a sum of consecutive naturals, for example, 60124 + ... + 60463.

It is an arithmetic number, because the mean of its divisors is an integer number (2441907).

Almost surely, 2^20499790 is an apocalyptic number.

20499790 is a deficient number, since it is larger than the sum of its proper divisors (18570722).

20499790 is a wasteful number, since it uses less digits than its factorization.

20499790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120611.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 20499790 is about 4527.6693783888. The cubic root of 20499790 is about 273.6842492020.

The spelling of 20499790 in words is "twenty million, four hundred ninety-nine thousand, seven hundred ninety".