20630505803 has 2 divisors, whose sum is σ = 20630505804. Its totient is φ = 20630505802.

The previous prime is 20630505781. The next prime is 20630505809. The reversal of 20630505803 is 30850503602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20630505803 - 2¹⁴ = 20630489419 is a prime.

It is a super-4 number, since 4×20630505803⁴ (a number of 42 digits) contains 4444 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20630505803.

It is not a weakly prime, because it can be changed into another prime (20630505809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10315252901 + 10315252902.

It is an arithmetic number, because the mean of its divisors is an integer number (10315252902).

Almost surely, 2^20630505803 is an apocalyptic number.

20630505803 is a deficient number, since it is larger than the sum of its proper divisors (1).

20630505803 is an equidigital number, since it uses as much as digits as its factorization.

20630505803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 20630505803 in words is "twenty billion, six hundred thirty million, five hundred five thousand, eight hundred three".