20624021 has 12 divisors (see below), whose sum is σ = 23260032. Its totient is φ = 18135000.

The previous prime is 20624003. The next prime is 20624041. The reversal of 20624021 is 12042602.

It is not a de Polignac number, because 20624021 - 2⁶ = 20623957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20624041) 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 11 ways as a sum of consecutive naturals, for example, 9596 + ... + 11546.

It is an arithmetic number, because the mean of its divisors is an integer number (1938336).

Almost surely, 2^20624021 is an apocalyptic number.

It is an amenable number.

20624021 is a deficient number, since it is larger than the sum of its proper divisors (2636011).

20624021 is a wasteful number, since it uses less digits than its factorization.

20624021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024 (or 1993 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20624021 is about 4541.3677455146. The cubic root of 20624021 is about 274.2359884616.

Adding to 20624021 its reverse (12042602), we get a palindrome (32666623).

The spelling of 20624021 in words is "twenty million, six hundred twenty-four thousand, twenty-one".