20606072161 has 4 divisors (see below), whose sum is σ = 20617630912. Its totient is φ = 20594513412.

The previous prime is 20606072131. The next prime is 20606072167. The reversal of 20606072161 is 16127060602.

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 20606072161 - 2⁵ = 20606072129 is a prime.

It is a super-2 number, since 2×20606072161² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20606072167) 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, 5776701 + ... + 5780266.

It is an arithmetic number, because the mean of its divisors is an integer number (5154407728).

Almost surely, 2^20606072161 is an apocalyptic number.

It is an amenable number.

20606072161 is a deficient number, since it is larger than the sum of its proper divisors (11558751).

20606072161 is a wasteful number, since it uses less digits than its factorization.

20606072161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11558750.

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 20606072161 in words is "twenty billion, six hundred six million, seventy-two thousand, one hundred sixty-one".