20555405886 has 16 divisors (see below), whose sum is σ = 41202378000. Its totient is φ = 6836540928.

The previous prime is 20555405881. The next prime is 20555405933. The reversal of 20555405886 is 68850455502.

It is a super-2 number, since 2×20555405886² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555405881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3812341 + ... + 3817728.

It is an arithmetic number, because the mean of its divisors is an integer number (2575148625).

Almost surely, 2^20555405886 is an apocalyptic number.

20555405886 is an abundant number, since it is smaller than the sum of its proper divisors (20646972114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20555405886 is a wasteful number, since it uses less digits than its factorization.

20555405886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7630523.

The product of its (nonzero) digits is 1920000, while the sum is 48.

The spelling of 20555405886 in words is "twenty billion, five hundred fifty-five million, four hundred five thousand, eight hundred eighty-six".