20630505403 has 2 divisors, whose sum is σ = 20630505404. Its totient is φ = 20630505402.

The previous prime is 20630505353. The next prime is 20630505421. The reversal of 20630505403 is 30450503602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20630505403 - 2¹³ = 20630497211 is a prime.

It is not a weakly prime, because it can be changed into another prime (20630505803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10315252701 + 10315252702.

It is an arithmetic number, because the mean of its divisors is an integer number (10315252702).

Almost surely, 2^20630505403 is an apocalyptic number.

20630505403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20630505403 is an equidigital number, since it uses as much as digits as its factorization.

20630505403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 28.

The spelling of 20630505403 in words is "twenty billion, six hundred thirty million, five hundred five thousand, four hundred three".