20541531 has 8 divisors (see below), whose sum is σ = 27412560. Its totient is φ = 13682432.

The previous prime is 20541523. The next prime is 20541557. The reversal of 20541531 is 13514502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20541531 - 2³ = 20541523 is a prime.

It is a super-2 number, since 2×20541531² = 843908991647922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20541498 and 20541507.

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 7 ways as a sum of consecutive naturals, for example, 2455 + ... + 6863.

It is an arithmetic number, because the mean of its divisors is an integer number (3426570).

Almost surely, 2^20541531 is an apocalyptic number.

20541531 is a deficient number, since it is larger than the sum of its proper divisors (6871029).

20541531 is a wasteful number, since it uses less digits than its factorization.

20541531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5965.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20541531 is about 4532.2765802629. The cubic root of 20541531 is about 273.8698788983.

The spelling of 20541531 in words is "twenty million, five hundred forty-one thousand, five hundred thirty-one".