20504197 has 8 divisors (see below), whose sum is σ = 23912000. Its totient is φ = 17574732.

The previous prime is 20504191. The next prime is 20504203. The reversal of 20504197 is 79140502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20504191) and next prime (20504203).

It is not a de Polignac number, because 20504197 - 2¹⁹ = 19979909 is a prime.

It is a super-2 number, since 2×20504197² = 840844189229618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504191) 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, 29547 + ... + 30232.

It is an arithmetic number, because the mean of its divisors is an integer number (2989000).

Almost surely, 2^20504197 is an apocalyptic number.

It is an amenable number.

20504197 is a deficient number, since it is larger than the sum of its proper divisors (3407803).

20504197 is an frugal number, since it uses more digits than its factorization.

20504197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59800 (or 59786 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20504197 is about 4528.1560264638. The cubic root of 20504197 is about 273.7038598104.

Adding to 20504197 its reverse (79140502), we get a palindrome (99644699).

The spelling of 20504197 in words is "twenty million, five hundred four thousand, one hundred ninety-seven".