20351161 has 4 divisors (see below), whose sum is σ = 20447824. Its totient is φ = 20254500.

The previous prime is 20351153. The next prime is 20351171. The reversal of 20351161 is 16115302.

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 20351161 - 2³ = 20351153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20351101) 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, 48015 + ... + 48436.

It is an arithmetic number, because the mean of its divisors is an integer number (5111956).

Almost surely, 2^20351161 is an apocalyptic number.

It is an amenable number.

20351161 is a deficient number, since it is larger than the sum of its proper divisors (96663).

20351161 is an equidigital number, since it uses as much as digits as its factorization.

20351161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96662.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 20351161 is about 4511.2261082770. The cubic root of 20351161 is about 273.0212160427.

Adding to 20351161 its reverse (16115302), we get a palindrome (36466463).

The spelling of 20351161 in words is "twenty million, three hundred fifty-one thousand, one hundred sixty-one".