20721082485 has 64 divisors (see below), whose sum is σ = 35671684608. Its totient is φ = 10233667584.

The previous prime is 20721082483. The next prime is 20721082493. The reversal of 20721082485 is 58428012702.

It is not a de Polignac number, because 20721082485 - 2¹ = 20721082483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20721082483) 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, 9362239 + ... + 9364451.

It is an arithmetic number, because the mean of its divisors is an integer number (557370072).

Almost surely, 2^20721082485 is an apocalyptic number.

It is an amenable number.

20721082485 is a deficient number, since it is larger than the sum of its proper divisors (14950602123).

20721082485 is a wasteful number, since it uses less digits than its factorization.

20721082485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2814.

The product of its (nonzero) digits is 71680, while the sum is 39.

The spelling of 20721082485 in words is "twenty billion, seven hundred twenty-one million, eighty-two thousand, four hundred eighty-five".