20555535215 has 4 divisors (see below), whose sum is σ = 24666642264. Its totient is φ = 16444428168.

The previous prime is 20555535181. The next prime is 20555535223. The reversal of 20555535215 is 51253555502.

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 20555535215 - 2⁶ = 20555535151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055553517 + ... + 2055553526.

It is an arithmetic number, because the mean of its divisors is an integer number (6166660566).

Almost surely, 2^20555535215 is an apocalyptic number.

20555535215 is a deficient number, since it is larger than the sum of its proper divisors (4111107049).

20555535215 is an equidigital number, since it uses as much as digits as its factorization.

20555535215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111107048.

The product of its (nonzero) digits is 187500, while the sum is 38.

The spelling of 20555535215 in words is "twenty billion, five hundred fifty-five million, five hundred thirty-five thousand, two hundred fifteen".