20055197 has 4 divisors (see below), whose sum is σ = 20175456. Its totient is φ = 19934940.

The previous prime is 20055187. The next prime is 20055199. The reversal of 20055197 is 79155002.

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 a cyclic number.

It is not a de Polignac number, because 20055197 - 2⁴ = 20055181 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 (20055199) 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, 59879 + ... + 60212.

It is an arithmetic number, because the mean of its divisors is an integer number (5043864).

Almost surely, 2^20055197 is an apocalyptic number.

It is an amenable number.

20055197 is a deficient number, since it is larger than the sum of its proper divisors (120259).

20055197 is a wasteful number, since it uses less digits than its factorization.

20055197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120258.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 20055197 is about 4478.3029151678. The cubic root of 20055197 is about 271.6912451364.

The spelling of 20055197 in words is "twenty million, fifty-five thousand, one hundred ninety-seven".