20529539 has 2 divisors, whose sum is σ = 20529540. Its totient is φ = 20529538.

The previous prime is 20529529. The next prime is 20529569. The reversal of 20529539 is 93592502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20529539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20529499 and 20529508.

It is not a weakly prime, because it can be changed into another prime (20529529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10264769 + 10264770.

It is an arithmetic number, because the mean of its divisors is an integer number (10264770).

Almost surely, 2^20529539 is an apocalyptic number.

20529539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20529539 is an equidigital number, since it uses as much as digits as its factorization.

20529539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 20529539 is about 4530.9534316742. The cubic root of 20529539 is about 273.8165740935.

The spelling of 20529539 in words is "twenty million, five hundred twenty-nine thousand, five hundred thirty-nine".