20645460203 has 2 divisors, whose sum is σ = 20645460204. Its totient is φ = 20645460202.

The previous prime is 20645460191. The next prime is 20645460221. The reversal of 20645460203 is 30206454602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20645460203 - 2¹⁰ = 20645459179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20645460203.

It is not a weakly prime, because it can be changed into another prime (20645462203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322730101 + 10322730102.

It is an arithmetic number, because the mean of its divisors is an integer number (10322730102).

Almost surely, 2^20645460203 is an apocalyptic number.

20645460203 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645460203 is an equidigital number, since it uses as much as digits as its factorization.

20645460203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 32.

The spelling of 20645460203 in words is "twenty billion, six hundred forty-five million, four hundred sixty thousand, two hundred three".