20884397 has 4 divisors (see below), whose sum is σ = 20902620. Its totient is φ = 20866176.

The previous prime is 20884393. The next prime is 20884399. The reversal of 20884397 is 79348802.

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 13205956 + 7678441 = 3634^2 + 2771^2 .

It is a cyclic number.

It is not a de Polignac number, because 20884397 - 2² = 20884393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20884393) 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, 7268 + ... + 9725.

It is an arithmetic number, because the mean of its divisors is an integer number (5225655).

Almost surely, 2^20884397 is an apocalyptic number.

It is an amenable number.

20884397 is a deficient number, since it is larger than the sum of its proper divisors (18223).

20884397 is a wasteful number, since it uses less digits than its factorization.

20884397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18222.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 20884397 is about 4569.9449668459. The cubic root of 20884397 is about 275.3852319990.

The spelling of 20884397 in words is "twenty million, eight hundred eighty-four thousand, three hundred ninety-seven".