20120023400189 has 2 divisors, whose sum is σ = 20120023400190. Its totient is φ = 20120023400188.

The previous prime is 20120023400129. The next prime is 20120023400263. The reversal of 20120023400189 is 98100432002102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19895212764025 + 224810636164 = 4460405^2 + 474142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120023400189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120023400129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060011700094 + 10060011700095.

It is an arithmetic number, because the mean of its divisors is an integer number (10060011700095).

Almost surely, 2^{20120023400189} is an apocalyptic number.

It is an amenable number.

20120023400189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120023400189 is an equidigital number, since it uses as much as digits as its factorization.

20120023400189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 20120023400189 in words is "twenty trillion, one hundred twenty billion, twenty-three million, four hundred thousand, one hundred eighty-nine".