20624045 has 16 divisors (see below), whose sum is σ = 26815152. Its totient is φ = 15137280.

The previous prime is 20624041. The next prime is 20624069. The reversal of 20624045 is 54042602.

It can be written as a sum of positive squares in 8 ways, for example, as 12945604 + 7678441 = 3598^2 + 2771^2 .

It is not a de Polignac number, because 20624045 - 2² = 20624041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20624045.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10889 + ... + 12641.

It is an arithmetic number, because the mean of its divisors is an integer number (1675947).

Almost surely, 2^20624045 is an apocalyptic number.

It is an amenable number.

20624045 is a deficient number, since it is larger than the sum of its proper divisors (6191107).

20624045 is a wasteful number, since it uses less digits than its factorization.

20624045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20624045 is about 4541.3703878895. The cubic root of 20624045 is about 274.2360948369.

Adding to 20624045 its reverse (54042602), we get a palindrome (74666647).

The spelling of 20624045 in words is "twenty million, six hundred twenty-four thousand, forty-five".