20708137 has 2 divisors, whose sum is σ = 20708138. Its totient is φ = 20708136.

The previous prime is 20708101. The next prime is 20708141. The reversal of 20708137 is 73180702.

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., 18224361 + 2483776 = 4269^2 + 1576^2 .

It is a cyclic number.

It is not a de Polignac number, because 20708137 - 2²³ = 12319529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20705137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10354068 + 10354069.

It is an arithmetic number, because the mean of its divisors is an integer number (10354069).

Almost surely, 2^20708137 is an apocalyptic number.

It is an amenable number.

20708137 is a deficient number, since it is larger than the sum of its proper divisors (1).

20708137 is an equidigital number, since it uses as much as digits as its factorization.

20708137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20708137 is about 4550.6194083883. The cubic root of 20708137 is about 274.6083106917.

Adding to 20708137 its reverse (73180702), we get a palindrome (93888839).

The spelling of 20708137 in words is "twenty million, seven hundred eight thousand, one hundred thirty-seven".