20804428086 has 16 divisors (see below), whose sum is σ = 44809537584. Its totient is φ = 6401362464.

The previous prime is 20804428069. The next prime is 20804428133. The reversal of 20804428086 is 68082440802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133361641 + ... + 133361796.

It is an arithmetic number, because the mean of its divisors is an integer number (2800596099).

Almost surely, 2^20804428086 is an apocalyptic number.

20804428086 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20804428086 is an abundant number, since it is smaller than the sum of its proper divisors (24005109498).

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

20804428086 is a wasteful number, since it uses less digits than its factorization.

20804428086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266723455.

The product of its (nonzero) digits is 196608, while the sum is 42.

Adding to 20804428086 its reverse (68082440802), we get a palindrome (88886868888).

The spelling of 20804428086 in words is "twenty billion, eight hundred four million, four hundred twenty-eight thousand, eighty-six".