20932866981 has 24 divisors (see below), whose sum is σ = 32648222880. Its totient is φ = 12847748256.

The previous prime is 20932866953. The next prime is 20932867001. The reversal of 20932866981 is 18966823902.

It is not a de Polignac number, because 20932866981 - 2⁵ = 20932866949 is a prime.

It is a super-2 number, since 2×20932866981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20932866781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191691 + ... + 280376.

It is an arithmetic number, because the mean of its divisors is an integer number (1360342620).

Almost surely, 2^20932866981 is an apocalyptic number.

It is an amenable number.

20932866981 is a deficient number, since it is larger than the sum of its proper divisors (11715355899).

20932866981 is a wasteful number, since it uses less digits than its factorization.

20932866981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472465 (or 472462 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 20932866981 in words is "twenty billion, nine hundred thirty-two million, eight hundred sixty-six thousand, nine hundred eighty-one".