20591903955 has 32 divisors (see below), whose sum is σ = 37661543424. Its totient is φ = 9411497856.

The previous prime is 20591903953. The next prime is 20591903989. The reversal of 20591903955 is 55930919502.

It is not a de Polignac number, because 20591903955 - 2¹ = 20591903953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20591903951) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 572977 + ... + 607853.

It is an arithmetic number, because the mean of its divisors is an integer number (1176923232).

Almost surely, 2^20591903955 is an apocalyptic number.

20591903955 is a deficient number, since it is larger than the sum of its proper divisors (17069639469).

20591903955 is a wasteful number, since it uses less digits than its factorization.

20591903955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40515.

The product of its (nonzero) digits is 546750, while the sum is 48.

The spelling of 20591903955 in words is "twenty billion, five hundred ninety-one million, nine hundred three thousand, nine hundred fifty-five".