20932817 has 2 divisors, whose sum is σ = 20932818. Its totient is φ = 20932816.

The previous prime is 20932811. The next prime is 20932819. The reversal of 20932817 is 71823902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 583696 = 4511^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 20932817 - 2⁴ = 20932801 is a prime.

Together with 20932819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20932811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10466408 + 10466409.

It is an arithmetic number, because the mean of its divisors is an integer number (10466409).

Almost surely, 2^20932817 is an apocalyptic number.

It is an amenable number.

20932817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20932817 is an equidigital number, since it uses as much as digits as its factorization.

20932817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20932817 is about 4575.2395565697. The cubic root of 20932817 is about 275.5978925355.

The spelling of 20932817 in words is "twenty million, nine hundred thirty-two thousand, eight hundred seventeen".