20318604461 has 2 divisors, whose sum is σ = 20318604462. Its totient is φ = 20318604460.

The previous prime is 20318604421. The next prime is 20318604499. The reversal of 20318604461 is 16440681302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20290578025 + 28026436 = 142445^2 + 5294^2 .

It is a cyclic number.

It is not a de Polignac number, because 20318604461 - 2²² = 20314410157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20318604421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10159302230 + 10159302231.

It is an arithmetic number, because the mean of its divisors is an integer number (10159302231).

Almost surely, 2^20318604461 is an apocalyptic number.

It is an amenable number.

20318604461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20318604461 is an equidigital number, since it uses as much as digits as its factorization.

20318604461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 20318604461 in words is "twenty billion, three hundred eighteen million, six hundred four thousand, four hundred sixty-one".