20541687 has 8 divisors (see below), whose sum is σ = 27905904. Its totient is φ = 13435968.

The previous prime is 20541671. The next prime is 20541701. The reversal of 20541687 is 78614502.

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

It is not a de Polignac number, because 20541687 - 2⁴ = 20541671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64438 + ... + 64755.

It is an arithmetic number, because the mean of its divisors is an integer number (3488238).

Almost surely, 2^20541687 is an apocalyptic number.

20541687 is a deficient number, since it is larger than the sum of its proper divisors (7364217).

20541687 is a wasteful number, since it uses less digits than its factorization.

20541687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129249.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20541687 is about 4532.2937901244. The cubic root of 20541687 is about 273.8705721863.

It can be divided in two parts, 2054 and 1687, that added together give a triangular number (3741 = T₈₆).

The spelling of 20541687 in words is "twenty million, five hundred forty-one thousand, six hundred eighty-seven".