20541519 has 12 divisors (see below), whose sum is σ = 30770376. Its totient is φ = 13694184.

The previous prime is 20541511. The next prime is 20541523. The reversal of 20541519 is 91514502.

It is not a de Polignac number, because 20541519 - 2³ = 20541511 is a prime.

It is a super-2 number, since 2×20541519² = 843908005654722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20541492 and 20541501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42024 + ... + 42509.

It is an arithmetic number, because the mean of its divisors is an integer number (2564198).

Almost surely, 2^20541519 is an apocalyptic number.

20541519 is a deficient number, since it is larger than the sum of its proper divisors (10228857).

20541519 is an frugal number, since it uses more digits than its factorization.

20541519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84548 (or 84536 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 20541519 is about 4532.2752564247. The cubic root of 20541519 is about 273.8698255683.

The spelling of 20541519 in words is "twenty million, five hundred forty-one thousand, five hundred nineteen".