20120665259 has 4 divisors (see below), whose sum is σ = 20995476816. Its totient is φ = 19245853704.

The previous prime is 20120665249. The next prime is 20120665261. The reversal of 20120665259 is 95256602102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95256602102 = 2 ⋅47628301051.

It is a de Polignac number, because none of the positive numbers 2^k-20120665259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20120665219) 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, 437405744 + ... + 437405789.

It is an arithmetic number, because the mean of its divisors is an integer number (5248869204).

Almost surely, 2^20120665259 is an apocalyptic number.

20120665259 is a deficient number, since it is larger than the sum of its proper divisors (874811557).

20120665259 is an equidigital number, since it uses as much as digits as its factorization.

20120665259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874811556.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 20120665259 in words is "twenty billion, one hundred twenty million, six hundred sixty-five thousand, two hundred fifty-nine".