20197158 has 8 divisors (see below), whose sum is σ = 40394328. Its totient is φ = 6732384.

The previous prime is 20197141. The next prime is 20197159. The reversal of 20197158 is 85179102.

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

20197158 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197159) 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, 1683091 + ... + 1683102.

It is an arithmetic number, because the mean of its divisors is an integer number (5049291).

Almost surely, 2^20197158 is an apocalyptic number.

20197158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20197158 is a wasteful number, since it uses less digits than its factorization.

20197158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366198.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 20197158 is about 4494.1248313771. The cubic root of 20197158 is about 272.3307952737.

The spelling of 20197158 in words is "twenty million, one hundred ninety-seven thousand, one hundred fifty-eight".