20932681 has 8 divisors (see below), whose sum is σ = 26097984. Its totient is φ = 16311120.

The previous prime is 20932679. The next prime is 20932753. The reversal of 20932681 is 18623902.

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

It is not a de Polignac number, because 20932681 - 2¹ = 20932679 is a prime.

It is a super-2 number, since 2×20932681² = 876354267695522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20932631) 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 7 ways as a sum of consecutive naturals, for example, 135850 + ... + 136003.

It is an arithmetic number, because the mean of its divisors is an integer number (3262248).

Almost surely, 2^20932681 is an apocalyptic number.

It is an amenable number.

20932681 is a deficient number, since it is larger than the sum of its proper divisors (5165303).

20932681 is a wasteful number, since it uses less digits than its factorization.

20932681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271871.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20932681 is about 4575.2246939358. The cubic root of 20932681 is about 275.5972956833.

It can be divided in two parts, 2093 and 2681, that added together give a palindrome (4774).

The spelling of 20932681 in words is "twenty million, nine hundred thirty-two thousand, six hundred eighty-one".