20640011401 has 2 divisors, whose sum is σ = 20640011402. Its totient is φ = 20640011400.

The previous prime is 20640011387. The next prime is 20640011411. The reversal of 20640011401 is 10411004602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12494768400 + 8145243001 = 111780^2 + 90251^2 .

It is a cyclic number.

It is not a de Polignac number, because 20640011401 - 2²¹ = 20637914249 is a prime.

It is not a weakly prime, because it can be changed into another prime (20640011411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320005700 + 10320005701.

It is an arithmetic number, because the mean of its divisors is an integer number (10320005701).

Almost surely, 2^20640011401 is an apocalyptic number.

It is an amenable number.

20640011401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20640011401 is an equidigital number, since it uses as much as digits as its factorization.

20640011401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The spelling of 20640011401 in words is "twenty billion, six hundred forty million, eleven thousand, four hundred one".