20541523 has 2 divisors, whose sum is σ = 20541524. Its totient is φ = 20541522.

The previous prime is 20541511. The next prime is 20541557. The reversal of 20541523 is 32514502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20541523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20541494 and 20541503.

It is not a weakly prime, because it can be changed into another prime (20541583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270761 + 10270762.

It is an arithmetic number, because the mean of its divisors is an integer number (10270762).

Almost surely, 2^20541523 is an apocalyptic number.

20541523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20541523 is an equidigital number, since it uses as much as digits as its factorization.

20541523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20541523 is about 4532.2756977042. The cubic root of 20541523 is about 273.8698433450.

The spelling of 20541523 in words is "twenty million, five hundred forty-one thousand, five hundred twenty-three".