20851528803 has 16 divisors (see below), whose sum is σ = 32449797120. Its totient is φ = 11661644736.

The previous prime is 20851528787. The next prime is 20851528829. The reversal of 20851528803 is 30882515802.

It is not a de Polignac number, because 20851528803 - 2⁴ = 20851528787 is a prime.

It is a super-2 number, since 2×20851528803² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20851528403) 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 15 ways as a sum of consecutive naturals, for example, 10562098 + ... + 10564071.

It is an arithmetic number, because the mean of its divisors is an integer number (2028112320).

Almost surely, 2^20851528803 is an apocalyptic number.

20851528803 is a deficient number, since it is larger than the sum of its proper divisors (11598268317).

20851528803 is a wasteful number, since it uses less digits than its factorization.

20851528803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21126226.

The product of its (nonzero) digits is 153600, while the sum is 42.

The spelling of 20851528803 in words is "twenty billion, eight hundred fifty-one million, five hundred twenty-eight thousand, eight hundred three".