20499147 has 12 divisors (see below), whose sum is σ = 30410640. Its totient is φ = 13296528.

The previous prime is 20499131. The next prime is 20499169. The reversal of 20499147 is 74199402.

20499147 is a `hidden beast` number, since 20 + 499 + 147 = 666.

It is not a de Polignac number, because 20499147 - 2⁴ = 20499131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20499047) 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 11 ways as a sum of consecutive naturals, for example, 30447 + ... + 31112.

It is an arithmetic number, because the mean of its divisors is an integer number (2534220).

Almost surely, 2^20499147 is an apocalyptic number.

20499147 is a deficient number, since it is larger than the sum of its proper divisors (9911493).

20499147 is a wasteful number, since it uses less digits than its factorization.

20499147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61602 (or 61599 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 20499147 is about 4527.5983699971. The cubic root of 20499147 is about 273.6813876960.

The spelling of 20499147 in words is "twenty million, four hundred ninety-nine thousand, one hundred forty-seven".