20201209985 has 32 divisors (see below), whose sum is σ = 27553665024. Its totient is φ = 14084856000.

The previous prime is 20201209981. The next prime is 20201210033. The reversal of 20201209985 is 58990210202.

It is not a de Polignac number, because 20201209985 - 2² = 20201209981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20201209981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127070 + ... + 237800.

It is an arithmetic number, because the mean of its divisors is an integer number (861052032).

Almost surely, 2^20201209985 is an apocalyptic number.

It is an amenable number.

20201209985 is a deficient number, since it is larger than the sum of its proper divisors (7352455039).

20201209985 is a wasteful number, since it uses less digits than its factorization.

20201209985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110885.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 20201209985 in words is "twenty billion, two hundred one million, two hundred nine thousand, nine hundred eighty-five".