20754917 has 2 divisors, whose sum is σ = 20754918. Its totient is φ = 20754916.

The previous prime is 20754911. The next prime is 20754919. The reversal of 20754917 is 71945702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12609601 + 8145316 = 3551^2 + 2854^2 .

It is a cyclic number.

It is not a de Polignac number, because 20754917 - 2⁸ = 20754661 is a prime.

Together with 20754919, 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 (20754911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10377458 + 10377459.

It is an arithmetic number, because the mean of its divisors is an integer number (10377459).

Almost surely, 2^20754917 is an apocalyptic number.

It is an amenable number.

20754917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20754917 is an equidigital number, since it uses as much as digits as its factorization.

20754917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 20754917 is about 4555.7564684693. The cubic root of 20754917 is about 274.8149366452.

The spelling of 20754917 in words is "twenty million, seven hundred fifty-four thousand, nine hundred seventeen".