20603513 has 4 divisors (see below), whose sum is σ = 23546880. Its totient is φ = 17660148.

The previous prime is 20603503. The next prime is 20603519. The reversal of 20603513 is 31530602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20603513 - 2²⁴ = 3826297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20603519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1471673 + ... + 1471686.

It is an arithmetic number, because the mean of its divisors is an integer number (5886720).

Almost surely, 2^20603513 is an apocalyptic number.

It is an amenable number.

20603513 is a deficient number, since it is larger than the sum of its proper divisors (2943367).

20603513 is an equidigital number, since it uses as much as digits as its factorization.

20603513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943366.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 20603513 is about 4539.1092738554. The cubic root of 20603513 is about 274.1450605607.

It can be divided in two parts, 206035 and 13, that multiplied together give a triangular number (2678455 = T₂₃₁₄).

The spelling of 20603513 in words is "twenty million, six hundred three thousand, five hundred thirteen".