20040690161 has 16 divisors (see below), whose sum is σ = 20979399168. Its totient is φ = 19123929600.

The previous prime is 20040690157. The next prime is 20040690221. The reversal of 20040690161 is 16109604002.

It is a cyclic number.

It is not a de Polignac number, because 20040690161 - 2² = 20040690157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20040620161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5457356 + ... + 5461026.

It is an arithmetic number, because the mean of its divisors is an integer number (1311212448).

Almost surely, 2^20040690161 is an apocalyptic number.

It is an amenable number.

20040690161 is a deficient number, since it is larger than the sum of its proper divisors (938709007).

20040690161 is a wasteful number, since it uses less digits than its factorization.

20040690161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6592.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 20040690161 in words is "twenty billion, forty million, six hundred ninety thousand, one hundred sixty-one".