20102001985 has 64 divisors (see below), whose sum is σ = 28043366400. Its totient is φ = 13701058560.

The previous prime is 20102001977. The next prime is 20102001989. The reversal of 20102001985 is 58910020102.

It is not a de Polignac number, because 20102001985 - 2³ = 20102001977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20102001989) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13664800 + ... + 13666270.

It is an arithmetic number, because the mean of its divisors is an integer number (438177600).

Almost surely, 2^20102001985 is an apocalyptic number.

It is an amenable number.

20102001985 is a deficient number, since it is larger than the sum of its proper divisors (7941364415).

20102001985 is a wasteful number, since it uses less digits than its factorization.

20102001985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738.

The product of its (nonzero) digits is 1440, while the sum is 28.

The spelling of 20102001985 in words is "twenty billion, one hundred two million, one thousand, nine hundred eighty-five".