20154324161 has 4 divisors (see below), whose sum is σ = 20227083732. Its totient is φ = 20081564592.

The previous prime is 20154324139. The next prime is 20154324167. The reversal of 20154324161 is 16142345102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3210355600 + 16943968561 = 56660^2 + 130169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20154324161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20154324167) 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, 36379370 + ... + 36379923.

It is an arithmetic number, because the mean of its divisors is an integer number (5056770933).

Almost surely, 2^20154324161 is an apocalyptic number.

It is an amenable number.

20154324161 is a deficient number, since it is larger than the sum of its proper divisors (72759571).

20154324161 is an equidigital number, since it uses as much as digits as its factorization.

20154324161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72759570.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 20154324161 its reverse (16142345102), we get a palindrome (36296669263).

The spelling of 20154324161 in words is "twenty billion, one hundred fifty-four million, three hundred twenty-four thousand, one hundred sixty-one".