20609911259 has 4 divisors (see below), whose sum is σ = 23554184304. Its totient is φ = 17665638216.

The previous prime is 20609911247. The next prime is 20609911261. The reversal of 20609911259 is 95211990602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95211990602 = 2 ⋅47605995301.

It is a cyclic number.

It is not a de Polignac number, because 20609911259 - 2²⁰ = 20608862683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20609911759) 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, 1472136512 + ... + 1472136525.

It is an arithmetic number, because the mean of its divisors is an integer number (5888546076).

Almost surely, 2^20609911259 is an apocalyptic number.

20609911259 is a deficient number, since it is larger than the sum of its proper divisors (2944273045).

20609911259 is an equidigital number, since it uses as much as digits as its factorization.

20609911259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944273044.

The product of its (nonzero) digits is 87480, while the sum is 44.

The spelling of 20609911259 in words is "twenty billion, six hundred nine million, nine hundred eleven thousand, two hundred fifty-nine".