20541511 has 2 divisors, whose sum is σ = 20541512. Its totient is φ = 20541510.

The previous prime is 20541497. The next prime is 20541523. The reversal of 20541511 is 11514502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20541511 - 2⁷ = 20541383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20541571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270755 + 10270756.

It is an arithmetic number, because the mean of its divisors is an integer number (10270756).

Almost surely, 2^20541511 is an apocalyptic number.

20541511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20541511 is an equidigital number, since it uses as much as digits as its factorization.

20541511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 20541511 is about 4532.2743738657. The cubic root of 20541511 is about 273.8697900150.

The spelling of 20541511 in words is "twenty million, five hundred forty-one thousand, five hundred eleven".