20350613 has 4 divisors (see below), whose sum is σ = 20400780. Its totient is φ = 20300448.

The previous prime is 20350609. The next prime is 20350621. The reversal of 20350613 is 31605302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8254129 + 12096484 = 2873^2 + 3478^2 .

It is a cyclic number.

It is not a de Polignac number, because 20350613 - 2² = 20350609 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 (20350643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24470 + ... + 25287.

It is an arithmetic number, because the mean of its divisors is an integer number (5100195).

Almost surely, 2^20350613 is an apocalyptic number.

It is an amenable number.

20350613 is a deficient number, since it is larger than the sum of its proper divisors (50167).

20350613 is an equidigital number, since it uses as much as digits as its factorization.

20350613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50166.

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

The square root of 20350613 is about 4511.1653705002. The cubic root of 20350613 is about 273.0187654541.

Adding to 20350613 its reverse (31605302), we get a palindrome (51955915).

The spelling of 20350613 in words is "twenty million, three hundred fifty thousand, six hundred thirteen".