20846939 has 4 divisors (see below), whose sum is σ = 20857224. Its totient is φ = 20836656.

The previous prime is 20846927. The next prime is 20846941. The reversal of 20846939 is 93964802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20846939 - 2¹⁶ = 20781403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20846896 and 20846905.

It is not an unprimeable number, because it can be changed into a prime (20846039) 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, 977 + ... + 6530.

It is an arithmetic number, because the mean of its divisors is an integer number (5214306).

Almost surely, 2^20846939 is an apocalyptic number.

20846939 is a deficient number, since it is larger than the sum of its proper divisors (10285).

20846939 is an equidigital number, since it uses as much as digits as its factorization.

20846939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10284.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20846939 is about 4565.8448287256. The cubic root of 20846939 is about 275.2204909350.

The spelling of 20846939 in words is "twenty million, eight hundred forty-six thousand, nine hundred thirty-nine".