20388510503 has 2 divisors, whose sum is σ = 20388510504. Its totient is φ = 20388510502.

The previous prime is 20388510473. The next prime is 20388510511. The reversal of 20388510503 is 30501588302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20388510503 - 2²⁴ = 20371733287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20388510553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194255251 + 10194255252.

It is an arithmetic number, because the mean of its divisors is an integer number (10194255252).

Almost surely, 2^20388510503 is an apocalyptic number.

20388510503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20388510503 is an equidigital number, since it uses as much as digits as its factorization.

20388510503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 20388510503 in words is "twenty billion, three hundred eighty-eight million, five hundred ten thousand, five hundred three".