20136400237 has 2 divisors, whose sum is σ = 20136400238. Its totient is φ = 20136400236.

The previous prime is 20136400213. The next prime is 20136400267. The reversal of 20136400237 is 73200463102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18657920836 + 1478479401 = 136594^2 + 38451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20136400237 is a prime.

It is a super-2 number, since 2×20136400237² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20136400267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10068200118 + 10068200119.

It is an arithmetic number, because the mean of its divisors is an integer number (10068200119).

Almost surely, 2^20136400237 is an apocalyptic number.

It is an amenable number.

20136400237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20136400237 is an equidigital number, since it uses as much as digits as its factorization.

20136400237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 28.

Adding to 20136400237 its reverse (73200463102), we get a palindrome (93336863339).

The spelling of 20136400237 in words is "twenty billion, one hundred thirty-six million, four hundred thousand, two hundred thirty-seven".