20475613 has 2 divisors, whose sum is σ = 20475614. Its totient is φ = 20475612.

The previous prime is 20475583. The next prime is 20475641. The reversal of 20475613 is 31657402.

It is an a-pointer prime, because the next prime (20475641) can be obtained adding 20475613 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18507204 + 1968409 = 4302^2 + 1403^2 .

It is a cyclic number.

It is not a de Polignac number, because 20475613 - 2⁹ = 20475101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20475643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10237806 + 10237807.

It is an arithmetic number, because the mean of its divisors is an integer number (10237807).

Almost surely, 2^20475613 is an apocalyptic number.

It is an amenable number.

20475613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20475613 is an equidigital number, since it uses as much as digits as its factorization.

20475613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20475613 is about 4524.9986740330. The cubic root of 20475613 is about 273.5766144886.

The spelling of 20475613 in words is "twenty million, four hundred seventy-five thousand, six hundred thirteen".