20519413 has 2 divisors, whose sum is σ = 20519414. Its totient is φ = 20519412.

The previous prime is 20519407. The next prime is 20519417. The reversal of 20519413 is 31491502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 956484 = 4423^2 + 978^2 .

It is a cyclic number.

It is not a de Polignac number, because 20519413 - 2¹³ = 20511221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20519417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10259706 + 10259707.

It is an arithmetic number, because the mean of its divisors is an integer number (10259707).

Almost surely, 2^20519413 is an apocalyptic number.

It is an amenable number.

20519413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20519413 is an equidigital number, since it uses as much as digits as its factorization.

20519413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20519413 is about 4529.8358689913. The cubic root of 20519413 is about 273.7715475488.

The spelling of 20519413 in words is "twenty million, five hundred nineteen thousand, four hundred thirteen".