20258049091 has 4 divisors (see below), whose sum is σ = 23152056112. Its totient is φ = 17364042072.

The previous prime is 20258049041. The next prime is 20258049127. The reversal of 20258049091 is 19094085202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19094085202 = 2 ⋅9547042601.

It is a cyclic number.

It is not a de Polignac number, because 20258049091 - 2⁹ = 20258048579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20258049001) 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, 1447003500 + ... + 1447003513.

It is an arithmetic number, because the mean of its divisors is an integer number (5788014028).

Almost surely, 2^20258049091 is an apocalyptic number.

20258049091 is a deficient number, since it is larger than the sum of its proper divisors (2894007021).

20258049091 is an equidigital number, since it uses as much as digits as its factorization.

20258049091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894007020.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 20258049091 in words is "twenty billion, two hundred fifty-eight million, forty-nine thousand, ninety-one".