20402364089 has 2 divisors, whose sum is σ = 20402364090. Its totient is φ = 20402364088.

The previous prime is 20402364053. The next prime is 20402364109. The reversal of 20402364089 is 98046320402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17655765625 + 2746598464 = 132875^2 + 52408^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402364089 - 2²⁰ = 20401315513 is a prime.

It is not a weakly prime, because it can be changed into another prime (20402364289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201182044 + 10201182045.

It is an arithmetic number, because the mean of its divisors is an integer number (10201182045).

Almost surely, 2^20402364089 is an apocalyptic number.

It is an amenable number.

20402364089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402364089 is an equidigital number, since it uses as much as digits as its factorization.

20402364089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 38.

The spelling of 20402364089 in words is "twenty billion, four hundred two million, three hundred sixty-four thousand, eighty-nine".