20940137 has 2 divisors, whose sum is σ = 20940138. Its totient is φ = 20940136.

The previous prime is 20940131. The next prime is 20940149. The reversal of 20940137 is 73104902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20939776 + 361 = 4576^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 20940137 - 2²⁰ = 19891561 is a prime.

It is not a weakly prime, because it can be changed into another prime (20940131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10470068 + 10470069.

It is an arithmetic number, because the mean of its divisors is an integer number (10470069).

Almost surely, 2^20940137 is an apocalyptic number.

It is an amenable number.

20940137 is a deficient number, since it is larger than the sum of its proper divisors (1).

20940137 is an equidigital number, since it uses as much as digits as its factorization.

20940137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20940137 is about 4576.0394447601. The cubic root of 20940137 is about 275.6300134148.

The spelling of 20940137 in words is "twenty million, nine hundred forty thousand, one hundred thirty-seven".