20973291 has 8 divisors (see below), whose sum is σ = 29609424. Its totient is φ = 13159680.

The previous prime is 20973287. The next prime is 20973299. The reversal of 20973291 is 19237902.

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

It is not a de Polignac number, because 20973291 - 2² = 20973287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20973299) 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, 205570 + ... + 205671.

It is an arithmetic number, because the mean of its divisors is an integer number (3701178).

Almost surely, 2^20973291 is an apocalyptic number.

20973291 is a deficient number, since it is larger than the sum of its proper divisors (8636133).

20973291 is a wasteful number, since it uses less digits than its factorization.

20973291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411261.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 20973291 is about 4579.6605769424. The cubic root of 20973291 is about 275.7754027680.

The spelling of 20973291 in words is "twenty million, nine hundred seventy-three thousand, two hundred ninety-one".