20426513 has 2 divisors, whose sum is σ = 20426514. Its totient is φ = 20426512.

The previous prime is 20426509. The next prime is 20426533. The reversal of 20426513 is 31562402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12902464 + 7524049 = 3592^2 + 2743^2 .

It is a cyclic number.

It is not a de Polignac number, because 20426513 - 2² = 20426509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20426533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10213256 + 10213257.

It is an arithmetic number, because the mean of its divisors is an integer number (10213257).

Almost surely, 2^20426513 is an apocalyptic number.

It is an amenable number.

20426513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20426513 is an equidigital number, since it uses as much as digits as its factorization.

20426513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20426513 is about 4519.5700016705. The cubic root of 20426513 is about 273.3577628704.

Adding to 20426513 its reverse (31562402), we get a palindrome (51988915).

The spelling of 20426513 in words is "twenty million, four hundred twenty-six thousand, five hundred thirteen".