20042197 has 8 divisors (see below), whose sum is σ = 23524736. Its totient is φ = 16714512.

The previous prime is 20042173. The next prime is 20042249. The reversal of 20042197 is 79124002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20042197 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 (20042107) 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, 38433 + ... + 38950.

It is an arithmetic number, because the mean of its divisors is an integer number (2940592).

Almost surely, 2^20042197 is an apocalyptic number.

It is an amenable number.

20042197 is a deficient number, since it is larger than the sum of its proper divisors (3482539).

20042197 is an equidigital number, since it uses as much as digits as its factorization.

20042197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77427.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20042197 is about 4476.8512371979. The cubic root of 20042197 is about 271.6325280265.

Adding to 20042197 its reverse (79124002), we get a palindrome (99166199).

The spelling of 20042197 in words is "twenty million, forty-two thousand, one hundred ninety-seven".