20680055 has 8 divisors (see below), whose sum is σ = 27072144. Its totient is φ = 15040000.

The previous prime is 20680043. The next prime is 20680063. The reversal of 20680055 is 55008602.

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

It is not a de Polignac number, because 20680055 - 2⁴ = 20680039 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187946 + ... + 188055.

It is an arithmetic number, because the mean of its divisors is an integer number (3384018).

Almost surely, 2^20680055 is an apocalyptic number.

20680055 is a deficient number, since it is larger than the sum of its proper divisors (6392089).

20680055 is a wasteful number, since it uses less digits than its factorization.

20680055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376017.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20680055 is about 4547.5328475999. The cubic root of 20680055 is about 274.4841237750.

Adding to 20680055 its reverse (55008602), we get a palindrome (75688657).

The spelling of 20680055 in words is "twenty million, six hundred eighty thousand, fifty-five".