20624336387 has 2 divisors, whose sum is σ = 20624336388. Its totient is φ = 20624336386.

The previous prime is 20624336333. The next prime is 20624336407. The reversal of 20624336387 is 78363342602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20624336387 - 2¹⁰ = 20624335363 is a prime.

It is not a weakly prime, because it can be changed into another prime (20624332387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10312168193 + 10312168194.

It is an arithmetic number, because the mean of its divisors is an integer number (10312168194).

Almost surely, 2^20624336387 is an apocalyptic number.

20624336387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20624336387 is an equidigital number, since it uses as much as digits as its factorization.

20624336387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 44.

Adding to 20624336387 its reverse (78363342602), we get a palindrome (98987678989).

The spelling of 20624336387 in words is "twenty billion, six hundred twenty-four million, three hundred thirty-six thousand, three hundred eighty-seven".