20021851885 has 8 divisors (see below), whose sum is σ = 27458539776. Its totient is φ = 13729269840.

The previous prime is 20021851867. The next prime is 20021851907. The reversal of 20021851885 is 58815812002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20021851885 - 2⁷ = 20021851757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 286026421 + ... + 286026490.

It is an arithmetic number, because the mean of its divisors is an integer number (3432317472).

Almost surely, 2^20021851885 is an apocalyptic number.

It is an amenable number.

20021851885 is a deficient number, since it is larger than the sum of its proper divisors (7436687891).

20021851885 is an equidigital number, since it uses as much as digits as its factorization.

20021851885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572052923.

The product of its (nonzero) digits is 51200, while the sum is 40.

The spelling of 20021851885 in words is "twenty billion, twenty-one million, eight hundred fifty-one thousand, eight hundred eighty-five".