20499123 has 8 divisors (see below), whose sum is σ = 27353088. Its totient is φ = 13655624.

The previous prime is 20499113. The next prime is 20499131. The reversal of 20499123 is 32199402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20499123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20499113) 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, 6286 + ... + 8972.

It is an arithmetic number, because the mean of its divisors is an integer number (3419136).

Almost surely, 2^20499123 is an apocalyptic number.

20499123 is a deficient number, since it is larger than the sum of its proper divisors (6853965).

20499123 is a wasteful number, since it uses less digits than its factorization.

20499123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20499123 is about 4527.5957195845. The cubic root of 20499123 is about 273.6812808890.

The spelling of 20499123 in words is "twenty million, four hundred ninety-nine thousand, one hundred twenty-three".