20097645 has 8 divisors (see below), whose sum is σ = 32156256. Its totient is φ = 10718736.

The previous prime is 20097643. The next prime is 20097677. The reversal of 20097645 is 54679002.

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

It is not a de Polignac number, because 20097645 - 2¹ = 20097643 is a prime.

It is a super-3 number, since 3×20097645³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20097643) 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, 669907 + ... + 669936.

It is an arithmetic number, because the mean of its divisors is an integer number (4019532).

Almost surely, 2^20097645 is an apocalyptic number.

It is an amenable number.

20097645 is a deficient number, since it is larger than the sum of its proper divisors (12058611).

20097645 is a wasteful number, since it uses less digits than its factorization.

20097645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339851.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20097645 is about 4483.0397053785. The cubic root of 20097645 is about 271.8827935406.

The spelling of 20097645 in words is "twenty million, ninety-seven thousand, six hundred forty-five".