20559097 has 4 divisors (see below), whose sum is σ = 22140580. Its totient is φ = 18977616.

The previous prime is 20559067. The next prime is 20559113. The reversal of 20559097 is 79095502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5067001 + 15492096 = 2251^2 + 3936^2 .

It is a cyclic number.

It is not a de Polignac number, because 20559097 - 2¹⁵ = 20526329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20559047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790722 + ... + 790747.

It is an arithmetic number, because the mean of its divisors is an integer number (5535145).

Almost surely, 2^20559097 is an apocalyptic number.

It is an amenable number.

20559097 is a deficient number, since it is larger than the sum of its proper divisors (1581483).

20559097 is a wasteful number, since it uses less digits than its factorization.

20559097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581482.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 20559097 is about 4534.2140443521. The cubic root of 20559097 is about 273.9479228642.

The spelling of 20559097 in words is "twenty million, five hundred fifty-nine thousand, ninety-seven".