20681032 has 8 divisors (see below), whose sum is σ = 38776950. Its totient is φ = 10340512.

The previous prime is 20681029. The next prime is 20681033. The reversal of 20681032 is 23018602.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 376996 = 4506^2 + 614^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20680994 and 20681012.

It is not an unprimeable number, because it can be changed into a prime (20681033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1292557 + ... + 1292572.

Almost surely, 2^20681032 is an apocalyptic number.

It is an amenable number.

20681032 is a deficient number, since it is larger than the sum of its proper divisors (18095918).

20681032 is a wasteful number, since it uses less digits than its factorization.

20681032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2585135 (or 2585131 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20681032 is about 4547.6402672155. The cubic root of 20681032 is about 274.4884462452.

Adding to 20681032 its reverse (23018602), we get a palindrome (43699634).

The spelling of 20681032 in words is "twenty million, six hundred eighty-one thousand, thirty-two".