20097281 has 8 divisors (see below), whose sum is σ = 21409920. Its totient is φ = 18799168.

The previous prime is 20097263. The next prime is 20097293. The reversal of 20097281 is 18279002.

It is a happy number.

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-20097281 is a prime.

It is a super-2 number, since 2×20097281² = 807801407185922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20097221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701 + ... + 6378.

It is an arithmetic number, because the mean of its divisors is an integer number (2676240).

Almost surely, 2^20097281 is an apocalyptic number.

It is an amenable number.

20097281 is a deficient number, since it is larger than the sum of its proper divisors (1312639).

20097281 is a wasteful number, since it uses less digits than its factorization.

20097281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7263.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20097281 is about 4482.9991077403. Note that the first 3 decimals coincide. The cubic root of 20097281 is about 271.8811521222.

The spelling of 20097281 in words is "twenty million, ninety-seven thousand, two hundred eighty-one".