20673454161 has 4 divisors (see below), whose sum is σ = 27564605552. Its totient is φ = 13782302772.

The previous prime is 20673454117. The next prime is 20673454187. The reversal of 20673454161 is 16145437602.

It is a happy number.

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 not a de Polignac number, because 20673454161 - 2⁹ = 20673453649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20673454861) 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, 3445575691 + ... + 3445575696.

It is an arithmetic number, because the mean of its divisors is an integer number (6891151388).

Almost surely, 2^20673454161 is an apocalyptic number.

It is an amenable number.

20673454161 is a deficient number, since it is larger than the sum of its proper divisors (6891151391).

20673454161 is an equidigital number, since it uses as much as digits as its factorization.

20673454161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6891151390.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 20673454161 in words is "twenty billion, six hundred seventy-three million, four hundred fifty-four thousand, one hundred sixty-one".