20555367215 has 4 divisors (see below), whose sum is σ = 24666440664. Its totient is φ = 16444293768.

The previous prime is 20555367211. The next prime is 20555367221. The reversal of 20555367215 is 51276355502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20555367215 - 2² = 20555367211 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 (20555367211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055536717 + ... + 2055536726.

It is an arithmetic number, because the mean of its divisors is an integer number (6166610166).

Almost surely, 2^20555367215 is an apocalyptic number.

20555367215 is a deficient number, since it is larger than the sum of its proper divisors (4111073449).

20555367215 is an equidigital number, since it uses as much as digits as its factorization.

20555367215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4111073448.

The product of its (nonzero) digits is 315000, while the sum is 41.

The spelling of 20555367215 in words is "twenty billion, five hundred fifty-five million, three hundred sixty-seven thousand, two hundred fifteen".