20836345 has 4 divisors (see below), whose sum is σ = 25003620. Its totient is φ = 16669072.

The previous prime is 20836337. The next prime is 20836351. The reversal of 20836345 is 54363802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54363802 = 2 ⋅27181901.

It can be written as a sum of positive squares in 2 ways, for example, as 8048569 + 12787776 = 2837^2 + 3576^2 .

It is a cyclic number.

It is not a de Polignac number, because 20836345 - 2³ = 20836337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083630 + ... + 2083639.

It is an arithmetic number, because the mean of its divisors is an integer number (6250905).

Almost surely, 2^20836345 is an apocalyptic number.

It is an amenable number.

20836345 is a deficient number, since it is larger than the sum of its proper divisors (4167275).

20836345 is an equidigital number, since it uses as much as digits as its factorization.

20836345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167274.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20836345 is about 4564.6845455080. The cubic root of 20836345 is about 275.1738625080.

The spelling of 20836345 in words is "twenty million, eight hundred thirty-six thousand, three hundred forty-five".