20036287657 has 2 divisors, whose sum is σ = 20036287658. Its totient is φ = 20036287656.

The previous prime is 20036287637. The next prime is 20036287673. The reversal of 20036287657 is 75678263002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10969629696 + 9066657961 = 104736^2 + 95219^2 .

It is a cyclic number.

It is not a de Polignac number, because 20036287657 - 2²³ = 20027899049 is a prime.

It is not a weakly prime, because it can be changed into another prime (20036287627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10018143828 + 10018143829.

It is an arithmetic number, because the mean of its divisors is an integer number (10018143829).

Almost surely, 2^20036287657 is an apocalyptic number.

It is an amenable number.

20036287657 is a deficient number, since it is larger than the sum of its proper divisors (1).

20036287657 is an equidigital number, since it uses as much as digits as its factorization.

20036287657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 20036287657 in words is "twenty billion, thirty-six million, two hundred eighty-seven thousand, six hundred fifty-seven".