20703613 has 4 divisors (see below), whose sum is σ = 23661280. Its totient is φ = 17745948.

The previous prime is 20703601. The next prime is 20703619. The reversal of 20703613 is 31630702.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31630702 = 2 ⋅15815351.

It is a cyclic number.

It is not a de Polignac number, because 20703613 - 2⁹ = 20703101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20703619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1478823 + ... + 1478836.

It is an arithmetic number, because the mean of its divisors is an integer number (5915320).

Almost surely, 2^20703613 is an apocalyptic number.

It is an amenable number.

20703613 is a deficient number, since it is larger than the sum of its proper divisors (2957667).

20703613 is an equidigital number, since it uses as much as digits as its factorization.

20703613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2957666.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 20703613 is about 4550.1223060485. The cubic root of 20703613 is about 274.5883118143.

It can be divided in two parts, 20703 and 613, that added together give a square (21316 = 146²).

The spelling of 20703613 in words is "twenty million, seven hundred three thousand, six hundred thirteen".