20513093 has 2 divisors, whose sum is σ = 20513094. Its totient is φ = 20513092.

The previous prime is 20513083. The next prime is 20513113. The reversal of 20513093 is 39031502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20367169 + 145924 = 4513^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 20513093 - 2⁶ = 20513029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20513083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256546 + 10256547.

It is an arithmetic number, because the mean of its divisors is an integer number (10256547).

Almost surely, 2^20513093 is an apocalyptic number.

It is an amenable number.

20513093 is a deficient number, since it is larger than the sum of its proper divisors (1).

20513093 is an equidigital number, since it uses as much as digits as its factorization.

20513093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 20513093 is about 4529.1382182486. The cubic root of 20513093 is about 273.7434373579.

Adding to 20513093 its reverse (39031502), we get a palindrome (59544595).

The spelling of 20513093 in words is "twenty million, five hundred thirteen thousand, ninety-three".