20346505 has 4 divisors (see below), whose sum is σ = 24415812. Its totient is φ = 16277200.

The previous prime is 20346499. The next prime is 20346533. The reversal of 20346505 is 50564302.

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 10055241 + 10291264 = 3171^2 + 3208^2 .

It is not a de Polignac number, because 20346505 - 2³ = 20346497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20346505.

It is an unprimeable number.

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, 2034646 + ... + 2034655.

It is an arithmetic number, because the mean of its divisors is an integer number (6103953).

Almost surely, 2^20346505 is an apocalyptic number.

It is an amenable number.

20346505 is a deficient number, since it is larger than the sum of its proper divisors (4069307).

20346505 is an equidigital number, since it uses as much as digits as its factorization.

20346505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069306.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20346505 is about 4510.7100327997. The cubic root of 20346505 is about 273.0003935822. Note that the first 3 decimals are identical.

The spelling of 20346505 in words is "twenty million, three hundred forty-six thousand, five hundred five".