20836845 has 20 divisors (see below), whose sum is σ = 37352700. Its totient is φ = 11112768.

The previous prime is 20836831. The next prime is 20836847. The reversal of 20836845 is 54863802.

It can be written as a sum of positive squares in 2 ways, for example, as 6953769 + 13883076 = 2637^2 + 3726^2 .

It is not a de Polignac number, because 20836845 - 2⁸ = 20836589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836847) 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 19 ways as a sum of consecutive naturals, for example, 25320 + ... + 26129.

It is an arithmetic number, because the mean of its divisors is an integer number (1867635).

Almost surely, 2^20836845 is an apocalyptic number.

It is an amenable number.

20836845 is a deficient number, since it is larger than the sum of its proper divisors (16515855).

20836845 is an equidigital number, since it uses as much as digits as its factorization.

20836845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51466 (or 51457 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 20836845 is about 4564.7393134767. The cubic root of 20836845 is about 275.1760635631.

The spelling of 20836845 in words is "twenty million, eight hundred thirty-six thousand, eight hundred forty-five".