20797854449 has 4 divisors (see below), whose sum is σ = 20914043760. Its totient is φ = 20681665140.

The previous prime is 20797854431. The next prime is 20797854457. The reversal of 20797854449 is 94445879702.

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 20797854449 - 2⁸ = 20797854193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20797854149) 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, 58094387 + ... + 58094744.

It is an arithmetic number, because the mean of its divisors is an integer number (5228510940).

Almost surely, 2^20797854449 is an apocalyptic number.

It is an amenable number.

20797854449 is a deficient number, since it is larger than the sum of its proper divisors (116189311).

20797854449 is a wasteful number, since it uses less digits than its factorization.

20797854449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116189310.

The product of its (nonzero) digits is 20321280, while the sum is 59.

The spelling of 20797854449 in words is "twenty billion, seven hundred ninety-seven million, eight hundred fifty-four thousand, four hundred forty-nine".