20451842813 has 2 divisors, whose sum is σ = 20451842814. Its totient is φ = 20451842812.

The previous prime is 20451842797. The next prime is 20451842819. The reversal of 20451842813 is 31824815402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20406979609 + 44863204 = 142853^2 + 6698^2 .

It is a cyclic number.

It is not a de Polignac number, because 20451842813 - 2⁴ = 20451842797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451842819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225921406 + 10225921407.

It is an arithmetic number, because the mean of its divisors is an integer number (10225921407).

Almost surely, 2^20451842813 is an apocalyptic number.

It is an amenable number.

20451842813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451842813 is an equidigital number, since it uses as much as digits as its factorization.

20451842813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61440, while the sum is 38.

The spelling of 20451842813 in words is "twenty billion, four hundred fifty-one million, eight hundred forty-two thousand, eight hundred thirteen".