20078517 has 8 divisors (see below), whose sum is σ = 27935424. Its totient is φ = 12803648.

The previous prime is 20078507. The next prime is 20078521. The reversal of 20078517 is 71587002.

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 not a de Polignac number, because 20078517 - 2⁶ = 20078453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20078507) 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, 145428 + ... + 145565.

It is an arithmetic number, because the mean of its divisors is an integer number (3491928).

Almost surely, 2^20078517 is an apocalyptic number.

It is an amenable number.

20078517 is a deficient number, since it is larger than the sum of its proper divisors (7856907).

20078517 is a wasteful number, since it uses less digits than its factorization.

20078517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291019.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 20078517 is about 4480.9058236031. The cubic root of 20078517 is about 271.7965110461.

The spelling of 20078517 in words is "twenty million, seventy-eight thousand, five hundred seventeen".