20606015640073 has 2 divisors, whose sum is σ = 20606015640074. Its totient is φ = 20606015640072.

The previous prime is 20606015640061. The next prime is 20606015640127. The reversal of 20606015640073 is 37004651060602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19577014366464 + 1029001273609 = 4424592^2 + 1014397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20606015640073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20606015640053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10303007820036 + 10303007820037.

It is an arithmetic number, because the mean of its divisors is an integer number (10303007820037).

Almost surely, 2^{20606015640073} is an apocalyptic number.

It is an amenable number.

20606015640073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20606015640073 is an equidigital number, since it uses as much as digits as its factorization.

20606015640073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 20606015640073 in words is "twenty trillion, six hundred six billion, fifteen million, six hundred forty thousand, seventy-three".