20514521 has 2 divisors, whose sum is σ = 20514522. Its totient is φ = 20514520.

The previous prime is 20514503. The next prime is 20514523. The reversal of 20514521 is 12541502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 978121 = 4420^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20514521 - 2⁶ = 20514457 is a prime.

Together with 20514523, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20514493 and 20514502.

It is not a weakly prime, because it can be changed into another prime (20514523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10257260 + 10257261.

It is an arithmetic number, because the mean of its divisors is an integer number (10257261).

Almost surely, 2^20514521 is an apocalyptic number.

It is an amenable number.

20514521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20514521 is an equidigital number, since it uses as much as digits as its factorization.

20514521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 20514521 is about 4529.2958613895. The cubic root of 20514521 is about 273.7497893426.

The spelling of 20514521 in words is "twenty million, five hundred fourteen thousand, five hundred twenty-one".