20652021 has 24 divisors (see below), whose sum is σ = 32323200. Its totient is φ = 12630816.

The previous prime is 20652017. The next prime is 20652041. The reversal of 20652021 is 12025602.

It is not a de Polignac number, because 20652021 - 2² = 20652017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20651985 and 20652003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20652001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22840 + ... + 23726.

It is an arithmetic number, because the mean of its divisors is an integer number (1346800).

Almost surely, 2^20652021 is an apocalyptic number.

It is an amenable number.

20652021 is a deficient number, since it is larger than the sum of its proper divisors (11671179).

20652021 is a wasteful number, since it uses less digits than its factorization.

20652021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105 (or 1102 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20652021 is about 4544.4494716082. The cubic root of 20652021 is about 274.3600369415.

Adding to 20652021 its reverse (12025602), we get a palindrome (32677623).

The spelling of 20652021 in words is "twenty million, six hundred fifty-two thousand, twenty-one".