20272009649 has 4 divisors (see below), whose sum is σ = 20298371940. Its totient is φ = 20245647360.

The previous prime is 20272009609. The next prime is 20272009691. The reversal of 20272009649 is 94690027202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94690027202 = 2 ⋅47345013601.

It can be written as a sum of positive squares in 2 ways, for example, as 5873689600 + 14398320049 = 76640^2 + 119993^2 .

It is a cyclic number.

It is not a de Polignac number, because 20272009649 - 2²⁴ = 20255232433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20272009609) 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, 13179992 + ... + 13181529.

It is an arithmetic number, because the mean of its divisors is an integer number (5074592985).

Almost surely, 2^20272009649 is an apocalyptic number.

It is an amenable number.

20272009649 is a deficient number, since it is larger than the sum of its proper divisors (26362291).

20272009649 is an equidigital number, since it uses as much as digits as its factorization.

20272009649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26362290.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 20272009649 in words is "twenty billion, two hundred seventy-two million, nine thousand, six hundred forty-nine".