20972195 has 4 divisors (see below), whose sum is σ = 25166640. Its totient is φ = 16777752.

The previous prime is 20972179. The next prime is 20972221. The reversal of 20972195 is 59127902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20972195 - 2⁴ = 20972179 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097215 + ... + 2097224.

It is an arithmetic number, because the mean of its divisors is an integer number (6291660).

Almost surely, 2^20972195 is an apocalyptic number.

20972195 is a deficient number, since it is larger than the sum of its proper divisors (4194445).

20972195 is an equidigital number, since it uses as much as digits as its factorization.

20972195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4194444.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 20972195 is about 4579.5409158561. The cubic root of 20972195 is about 275.7705989581.

The spelling of 20972195 in words is "twenty million, nine hundred seventy-two thousand, one hundred ninety-five".