20428984913 has 2 divisors, whose sum is σ = 20428984914. Its totient is φ = 20428984912.

The previous prime is 20428984897. The next prime is 20428984921. The reversal of 20428984913 is 31948982402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16653128209 + 3775856704 = 129047^2 + 61448^2 .

It is a cyclic number.

It is not a de Polignac number, because 20428984913 - 2⁴ = 20428984897 is a prime.

It is not a weakly prime, because it can be changed into another prime (20428984943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214492456 + 10214492457.

It is an arithmetic number, because the mean of its divisors is an integer number (10214492457).

Almost surely, 2^20428984913 is an apocalyptic number.

It is an amenable number.

20428984913 is a deficient number, since it is larger than the sum of its proper divisors (1).

20428984913 is an equidigital number, since it uses as much as digits as its factorization.

20428984913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 20428984913 in words is "twenty billion, four hundred twenty-eight million, nine hundred eighty-four thousand, nine hundred thirteen".