20971199 has 8 divisors (see below), whose sum is σ = 21671712. Its totient is φ = 20282080.

The previous prime is 20971157. The next prime is 20971219. The reversal of 20971199 is 99117902.

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 20971199 - 2¹⁶ = 20905663 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 (20971799) 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, 977 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (2708964).

Almost surely, 2^20971199 is an apocalyptic number.

20971199 is a deficient number, since it is larger than the sum of its proper divisors (700513).

20971199 is an equidigital number, since it uses as much as digits as its factorization.

20971199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5697.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 20971199 is about 4579.4321700403. The cubic root of 20971199 is about 275.7662333069.

The spelling of 20971199 in words is "twenty million, nine hundred seventy-one thousand, one hundred ninety-nine".