20906624461 has 2 divisors, whose sum is σ = 20906624462. Its totient is φ = 20906624460.

The previous prime is 20906624423. The next prime is 20906624491. The reversal of 20906624461 is 16442660902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20240468361 + 666156100 = 142269^2 + 25810^2 .

It is a cyclic number.

It is not a de Polignac number, because 20906624461 - 2⁹ = 20906623949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20906624491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10453312230 + 10453312231.

It is an arithmetic number, because the mean of its divisors is an integer number (10453312231).

Almost surely, 2^20906624461 is an apocalyptic number.

It is an amenable number.

20906624461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20906624461 is an equidigital number, since it uses as much as digits as its factorization.

20906624461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 20906624461 in words is "twenty billion, nine hundred six million, six hundred twenty-four thousand, four hundred sixty-one".