20154197 has 16 divisors (see below), whose sum is σ = 24520320. Its totient is φ = 16171008.

The previous prime is 20154191. The next prime is 20154227. The reversal of 20154197 is 79145102.

It is not a de Polignac number, because 20154197 - 2⁴ = 20154181 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 (20154191) 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 15 ways as a sum of consecutive naturals, for example, 30254 + ... + 30912.

It is an arithmetic number, because the mean of its divisors is an integer number (1532520).

Almost surely, 2^20154197 is an apocalyptic number.

It is an amenable number.

20154197 is a deficient number, since it is larger than the sum of its proper divisors (4366123).

20154197 is a wasteful number, since it uses less digits than its factorization.

20154197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 20154197 is about 4489.3426022080. The cubic root of 20154197 is about 272.1375682786.

Adding to 20154197 its reverse (79145102), we get a palindrome (99299299).

The spelling of 20154197 in words is "twenty million, one hundred fifty-four thousand, one hundred ninety-seven".