20555442015 has 16 divisors (see below), whose sum is σ = 32893034496. Its totient is φ = 10961460000.

The previous prime is 20555442007. The next prime is 20555442023. The reversal of 20555442015 is 51024455502.

It is an interprime number because it is at equal distance from previous prime (20555442007) and next prime (20555442023).

It is not a de Polignac number, because 20555442015 - 2³ = 20555442007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33090 + ... + 205440.

It is an arithmetic number, because the mean of its divisors is an integer number (2055814656).

Almost surely, 2^20555442015 is an apocalyptic number.

20555442015 is a deficient number, since it is larger than the sum of its proper divisors (12337592481).

20555442015 is a wasteful number, since it uses less digits than its factorization.

20555442015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180310.

The product of its (nonzero) digits is 40000, while the sum is 33.

Adding to 20555442015 its reverse (51024455502), we get a palindrome (71579897517).

The spelling of 20555442015 in words is "twenty billion, five hundred fifty-five million, four hundred forty-two thousand, fifteen".