20547097 has 4 divisors (see below), whose sum is σ = 20562640. Its totient is φ = 20531556.

The previous prime is 20547089. The next prime is 20547139. The reversal of 20547097 is 79074502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20547097 - 2³ = 20547089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20547997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5583 + ... + 8500.

It is an arithmetic number, because the mean of its divisors is an integer number (5140660).

Almost surely, 2^20547097 is an apocalyptic number.

It is an amenable number.

20547097 is a deficient number, since it is larger than the sum of its proper divisors (15543).

20547097 is a wasteful number, since it uses less digits than its factorization.

20547097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15542.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20547097 is about 4532.8905788691. The cubic root of 20547097 is about 273.8946128886.

The spelling of 20547097 in words is "twenty million, five hundred forty-seven thousand, ninety-seven".