20124400237 has 2 divisors, whose sum is σ = 20124400238. Its totient is φ = 20124400236.

The previous prime is 20124400217. The next prime is 20124400253. The reversal of 20124400237 is 73200442102.

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., 20055941161 + 68459076 = 141619^2 + 8274^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20124400237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20124400207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062200118 + 10062200119.

It is an arithmetic number, because the mean of its divisors is an integer number (10062200119).

Almost surely, 2^20124400237 is an apocalyptic number.

It is an amenable number.

20124400237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20124400237 is an equidigital number, since it uses as much as digits as its factorization.

20124400237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 25.

Adding to 20124400237 its reverse (73200442102), we get a palindrome (93324842339).

The spelling of 20124400237 in words is "twenty billion, one hundred twenty-four million, four hundred thousand, two hundred thirty-seven".