20197149 has 8 divisors (see below), whose sum is σ = 30776640. Its totient is φ = 11541216.

The previous prime is 20197141. The next prime is 20197159. The reversal of 20197149 is 94179102.

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

It is not a de Polignac number, because 20197149 - 2³ = 20197141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480864 + ... + 480905.

It is an arithmetic number, because the mean of its divisors is an integer number (3847080).

Almost surely, 2^20197149 is an apocalyptic number.

It is an amenable number.

20197149 is a deficient number, since it is larger than the sum of its proper divisors (10579491).

20197149 is an equidigital number, since it uses as much as digits as its factorization.

20197149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961779.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 20197149 is about 4494.1238300697. The cubic root of 20197149 is about 272.3307548228.

The spelling of 20197149 in words is "twenty million, one hundred ninety-seven thousand, one hundred forty-nine".