20971587901 has 32 divisors (see below), whose sum is σ = 23870943360. Its totient is φ = 18256492800.

The previous prime is 20971587899. The next prime is 20971587961. The reversal of 20971587901 is 10978517902.

It is a cyclic number.

It is not a de Polignac number, because 20971587901 - 2¹ = 20971587899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20971587961) 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, 6963486 + ... + 6966496.

It is an arithmetic number, because the mean of its divisors is an integer number (745966980).

Almost surely, 2^20971587901 is an apocalyptic number.

It is an amenable number.

20971587901 is a deficient number, since it is larger than the sum of its proper divisors (2899355459).

20971587901 is a wasteful number, since it uses less digits than its factorization.

20971587901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325.

The product of its (nonzero) digits is 317520, while the sum is 49.

The spelling of 20971587901 in words is "twenty billion, nine hundred seventy-one million, five hundred eighty-seven thousand, nine hundred one".