20228689813 has 2 divisors, whose sum is σ = 20228689814. Its totient is φ = 20228689812.

The previous prime is 20228689799. The next prime is 20228689823. The reversal of 20228689813 is 31898682202.

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., 20120571409 + 108118404 = 141847^2 + 10398^2 .

It is a cyclic number.

It is not a de Polignac number, because 20228689813 - 2⁹ = 20228689301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20228689823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10114344906 + 10114344907.

It is an arithmetic number, because the mean of its divisors is an integer number (10114344907).

Almost surely, 2^20228689813 is an apocalyptic number.

It is an amenable number.

20228689813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20228689813 is an equidigital number, since it uses as much as digits as its factorization.

20228689813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 663552, while the sum is 49.

The spelling of 20228689813 in words is "twenty billion, two hundred twenty-eight million, six hundred eighty-nine thousand, eight hundred thirteen".