20939817201 has 32 divisors (see below), whose sum is σ = 29769638400. Its totient is φ = 13046688000.

The previous prime is 20939817193. The next prime is 20939817211. The reversal of 20939817201 is 10271893902.

It is not a de Polignac number, because 20939817201 - 2³ = 20939817193 is a prime.

It is a super-2 number, since 2×20939817201² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20939817211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9301326 + ... + 9303576.

It is an arithmetic number, because the mean of its divisors is an integer number (930301200).

Almost surely, 2^20939817201 is an apocalyptic number.

It is an amenable number.

20939817201 is a deficient number, since it is larger than the sum of its proper divisors (8829821199).

20939817201 is a wasteful number, since it uses less digits than its factorization.

20939817201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469.

The product of its (nonzero) digits is 54432, while the sum is 42.

The spelling of 20939817201 in words is "twenty billion, nine hundred thirty-nine million, eight hundred seventeen thousand, two hundred one".