20378737 has 2 divisors, whose sum is σ = 20378738. Its totient is φ = 20378736.

The previous prime is 20378731. The next prime is 20378747. The reversal of 20378737 is 73787302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13571856 + 6806881 = 3684^2 + 2609^2 .

It is a cyclic number.

It is not a de Polignac number, because 20378737 - 2²³ = 11990129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20378696 and 20378705.

It is not a weakly prime, because it can be changed into another prime (20378731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10189368 + 10189369.

It is an arithmetic number, because the mean of its divisors is an integer number (10189369).

Almost surely, 2^20378737 is an apocalyptic number.

It is an amenable number.

20378737 is a deficient number, since it is larger than the sum of its proper divisors (1).

20378737 is an equidigital number, since it uses as much as digits as its factorization.

20378737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 20378737 is about 4514.2814489130. The cubic root of 20378737 is about 273.1444757602.

It can be divided in two parts, 20378 and 737, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20378737 in words is "twenty million, three hundred seventy-eight thousand, seven hundred thirty-seven".