20515400203 has 2 divisors, whose sum is σ = 20515400204. Its totient is φ = 20515400202.

The previous prime is 20515400177. The next prime is 20515400231. The reversal of 20515400203 is 30200451502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20515400203 - 2³³ = 11925465611 is a prime.

It is not a weakly prime, because it can be changed into another prime (20515403203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10257700101 + 10257700102.

It is an arithmetic number, because the mean of its divisors is an integer number (10257700102).

Almost surely, 2^20515400203 is an apocalyptic number.

20515400203 is a deficient number, since it is larger than the sum of its proper divisors (1).

20515400203 is an equidigital number, since it uses as much as digits as its factorization.

20515400203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 20515400203 its reverse (30200451502), we get a palindrome (50715851705).

The spelling of 20515400203 in words is "twenty billion, five hundred fifteen million, four hundred thousand, two hundred three".