20624693 has 2 divisors, whose sum is σ = 20624694. Its totient is φ = 20624692.

The previous prime is 20624663. The next prime is 20624699. The reversal of 20624693 is 39642602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18335524 + 2289169 = 4282^2 + 1513^2 .

It is a cyclic number.

It is not a de Polignac number, because 20624693 - 2¹² = 20620597 is a prime.

It is a super-2 number, since 2×20624693² = 850755922688498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20624699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10312346 + 10312347.

It is an arithmetic number, because the mean of its divisors is an integer number (10312347).

Almost surely, 2^20624693 is an apocalyptic number.

It is an amenable number.

20624693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20624693 is an equidigital number, since it uses as much as digits as its factorization.

20624693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 20624693 is about 4541.4417314329. The cubic root of 20624693 is about 274.2389669396.

The spelling of 20624693 in words is "twenty million, six hundred twenty-four thousand, six hundred ninety-three".