20346913 has 4 divisors (see below), whose sum is σ = 20575620. Its totient is φ = 20118208.

The previous prime is 20346899. The next prime is 20346919. The reversal of 20346913 is 31964302.

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 5230369 + 15116544 = 2287^2 + 3888^2 .

It is a cyclic number.

It is not a de Polignac number, because 20346913 - 2⁹ = 20346401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20346919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114220 + ... + 114397.

It is an arithmetic number, because the mean of its divisors is an integer number (5143905).

Almost surely, 2^20346913 is an apocalyptic number.

It is an amenable number.

20346913 is a deficient number, since it is larger than the sum of its proper divisors (228707).

20346913 is an equidigital number, since it uses as much as digits as its factorization.

20346913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228706.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20346913 is about 4510.7552582688. The cubic root of 20346913 is about 273.0022183578.

The spelling of 20346913 in words is "twenty million, three hundred forty-six thousand, nine hundred thirteen".