20845331 has 8 divisors (see below), whose sum is σ = 22518384. Its totient is φ = 19182240.

The previous prime is 20845327. The next prime is 20845333. The reversal of 20845331 is 13354802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20845331 - 2² = 20845327 is a prime.

It is a super-2 number, since 2×20845331² = 869055648999122, which contains 22 as substring.

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 20845331.

It is not an unprimeable number, because it can be changed into a prime (20845333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2201 + ... + 6821.

It is an arithmetic number, because the mean of its divisors is an integer number (2814798).

Almost surely, 2^20845331 is an apocalyptic number.

20845331 is a deficient number, since it is larger than the sum of its proper divisors (1673053).

20845331 is a wasteful number, since it uses less digits than its factorization.

20845331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4981.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20845331 is about 4565.6687352457. The cubic root of 20845331 is about 275.2134145015.

The spelling of 20845331 in words is "twenty million, eight hundred forty-five thousand, three hundred thirty-one".