20967321 has 4 divisors (see below), whose sum is σ = 27956432. Its totient is φ = 13978212.

The previous prime is 20967313. The next prime is 20967337. The reversal of 20967321 is 12376902.

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 20967321 - 2³ = 20967313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20967371) 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, 3494551 + ... + 3494556.

It is an arithmetic number, because the mean of its divisors is an integer number (6989108).

Almost surely, 2^20967321 is an apocalyptic number.

It is an amenable number.

20967321 is a deficient number, since it is larger than the sum of its proper divisors (6989111).

20967321 is an equidigital number, since it uses as much as digits as its factorization.

20967321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6989110.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20967321 is about 4579.0087355234. The cubic root of 20967321 is about 275.7492340027.

The spelling of 20967321 in words is "twenty million, nine hundred sixty-seven thousand, three hundred twenty-one".