20806821062 has 16 divisors (see below), whose sum is σ = 32582021472. Its totient is φ = 9946559040.

The previous prime is 20806821031. The next prime is 20806821071. The reversal of 20806821062 is 26012860802.

It is a congruent number.

It is an unprimeable number.

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, 338 + ... + 203994.

It is an arithmetic number, because the mean of its divisors is an integer number (2036376342).

Almost surely, 2^20806821062 is an apocalyptic number.

20806821062 is a deficient number, since it is larger than the sum of its proper divisors (11775200410).

20806821062 is a wasteful number, since it uses less digits than its factorization.

20806821062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205903.

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 20806821062 in words is "twenty billion, eight hundred six million, eight hundred twenty-one thousand, sixty-two".