20041997 has 8 divisors (see below), whose sum is σ = 21390336. Its totient is φ = 18712512.

The previous prime is 20041981. The next prime is 20042041. The reversal of 20041997 is 79914002.

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

It is not a de Polignac number, because 20041997 - 2⁴ = 20041981 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 (20040997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2483 + ... + 6800.

It is an arithmetic number, because the mean of its divisors is an integer number (2673792).

Almost surely, 2^20041997 is an apocalyptic number.

It is an amenable number.

20041997 is a deficient number, since it is larger than the sum of its proper divisors (1348339).

20041997 is a wasteful number, since it uses less digits than its factorization.

20041997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9427.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20041997 is about 4476.8289000139. The cubic root of 20041997 is about 271.6316244880.

Adding to 20041997 its reverse (79914002), we get a palindrome (99955999).

The spelling of 20041997 in words is "twenty million, forty-one thousand, nine hundred ninety-seven".