20939464481 has 8 divisors (see below), whose sum is σ = 22621333224. Its totient is φ = 19267758720.

The previous prime is 20939464459. The next prime is 20939464517. The reversal of 20939464481 is 18446493902.

It can be written as a sum of positive squares in 4 ways, for example, as 1131716881 + 19807747600 = 33641^2 + 140740^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20939464481 is a prime.

It is a super-2 number, since 2×20939464481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20939464781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2536460 + ... + 2544701.

It is an arithmetic number, because the mean of its divisors is an integer number (2827666653).

Almost surely, 2^20939464481 is an apocalyptic number.

It is an amenable number.

20939464481 is a deficient number, since it is larger than the sum of its proper divisors (1681868743).

20939464481 is a wasteful number, since it uses less digits than its factorization.

20939464481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5081491.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 20939464481 in words is "twenty billion, nine hundred thirty-nine million, four hundred sixty-four thousand, four hundred eighty-one".