20373917 has 2 divisors, whose sum is σ = 20373918. Its totient is φ = 20373916.

The previous prime is 20373911. The next prime is 20373919. The reversal of 20373917 is 71937302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19971961 + 401956 = 4469^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 20373917 - 2²⁴ = 3596701 is a prime.

Together with 20373919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20373911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10186958 + 10186959.

It is an arithmetic number, because the mean of its divisors is an integer number (10186959).

Almost surely, 2^20373917 is an apocalyptic number.

It is an amenable number.

20373917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20373917 is an equidigital number, since it uses as much as digits as its factorization.

20373917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 20373917 is about 4513.7475560780. The cubic root of 20373917 is about 273.1229392573.

The spelling of 20373917 in words is "twenty million, three hundred seventy-three thousand, nine hundred seventeen".