20994321 has 4 divisors (see below), whose sum is σ = 27992432. Its totient is φ = 13996212.

The previous prime is 20994319. The next prime is 20994343. The reversal of 20994321 is 12349902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20994321 - 2¹ = 20994319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20994821) 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, 3499051 + ... + 3499056.

It is an arithmetic number, because the mean of its divisors is an integer number (6998108).

Almost surely, 2^20994321 is an apocalyptic number.

It is an amenable number.

20994321 is a deficient number, since it is larger than the sum of its proper divisors (6998111).

20994321 is an equidigital number, since it uses as much as digits as its factorization.

20994321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6998110.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20994321 is about 4581.9560233595. The cubic root of 20994321 is about 275.8675456652.

The spelling of 20994321 in words is "twenty million, nine hundred ninety-four thousand, three hundred twenty-one".