20555588613 has 64 divisors (see below), whose sum is σ = 32832000000. Its totient is φ = 11194619904.

The previous prime is 20555588609. The next prime is 20555588617. The reversal of 20555588613 is 31688555502.

It is an interprime number because it is at equal distance from previous prime (20555588609) and next prime (20555588617).

It is not a de Polignac number, because 20555588613 - 2² = 20555588609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555588617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16457013 + ... + 16458261.

It is an arithmetic number, because the mean of its divisors is an integer number (513000000).

Almost surely, 2^20555588613 is an apocalyptic number.

It is an amenable number.

20555588613 is a deficient number, since it is larger than the sum of its proper divisors (12276411387).

20555588613 is a wasteful number, since it uses less digits than its factorization.

20555588613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714.

The product of its (nonzero) digits is 1440000, while the sum is 48.

The spelling of 20555588613 in words is "twenty billion, five hundred fifty-five million, five hundred eighty-eight thousand, six hundred thirteen".