20955197 has 6 divisors (see below), whose sum is σ = 21703578. Its totient is φ = 20231792.

The previous prime is 20955173. The next prime is 20955199. The reversal of 20955197 is 79155902.

It can be written as a sum of positive squares in 3 ways, for example, as 5067001 + 15888196 = 2251^2 + 3986^2 .

It is not a de Polignac number, because 20955197 - 2⁶ = 20955133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20955197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20955199) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11618 + ... + 13299.

It is an arithmetic number, because the mean of its divisors is an integer number (3617263).

Almost surely, 2^20955197 is an apocalyptic number.

It is an amenable number.

20955197 is a deficient number, since it is larger than the sum of its proper divisors (748381).

20955197 is an equidigital number, since it uses as much as digits as its factorization.

20955197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24975 (or 24946 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 20955197 is about 4577.6846767771. The cubic root of 20955197 is about 275.6960746394.

The spelling of 20955197 in words is "twenty million, nine hundred fifty-five thousand, one hundred ninety-seven".