20867452161 has 4 divisors (see below), whose sum is σ = 27823269552. Its totient is φ = 13911634772.

The previous prime is 20867452147. The next prime is 20867452163. The reversal of 20867452161 is 16125476802.

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 a cyclic number.

It is not a de Polignac number, because 20867452161 - 2⁷ = 20867452033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20867452163) 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, 3477908691 + ... + 3477908696.

It is an arithmetic number, because the mean of its divisors is an integer number (6955817388).

Almost surely, 2^20867452161 is an apocalyptic number.

It is an amenable number.

20867452161 is a deficient number, since it is larger than the sum of its proper divisors (6955817391).

20867452161 is an equidigital number, since it uses as much as digits as its factorization.

20867452161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6955817390.

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 20867452161 in words is "twenty billion, eight hundred sixty-seven million, four hundred fifty-two thousand, one hundred sixty-one".