20005523 has 2 divisors, whose sum is σ = 20005524. Its totient is φ = 20005522.

The previous prime is 20005519. The next prime is 20005529. The reversal of 20005523 is 32550002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20005523 - 2² = 20005519 is a prime.

It is not a weakly prime, because it can be changed into another prime (20005529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002761 + 10002762.

It is an arithmetic number, because the mean of its divisors is an integer number (10002762).

Almost surely, 2^20005523 is an apocalyptic number.

20005523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005523 is an equidigital number, since it uses as much as digits as its factorization.

20005523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 17.

The square root of 20005523 is about 4472.7534025475. The cubic root of 20005523 is about 271.4667455740.

Adding to 20005523 its reverse (32550002), we get a palindrome (52555525).

The spelling of 20005523 in words is "twenty million, five thousand, five hundred twenty-three".