20005529 has 2 divisors, whose sum is σ = 20005530. Its totient is φ = 20005528.

The previous prime is 20005523. The next prime is 20005541. The reversal of 20005529 is 92550002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13104400 + 6901129 = 3620^2 + 2627^2 .

It is a cyclic number.

It is not a de Polignac number, because 20005529 - 2¹⁶ = 19939993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20005523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002764 + 10002765.

It is an arithmetic number, because the mean of its divisors is an integer number (10002765).

Almost surely, 2^20005529 is an apocalyptic number.

It is an amenable number.

20005529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005529 is an equidigital number, since it uses as much as digits as its factorization.

20005529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 20005529 is about 4472.7540732752. The cubic root of 20005529 is about 271.4667727132.

The spelling of 20005529 in words is "twenty million, five thousand, five hundred twenty-nine".