20540645 has 8 divisors (see below), whose sum is σ = 25173504. Its totient is φ = 16082704.

The previous prime is 20540629. The next prime is 20540647. The reversal of 20540645 is 54604502.

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 20540645 - 2⁴ = 20540629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540647) 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, 43469 + ... + 43938.

It is an arithmetic number, because the mean of its divisors is an integer number (3146688).

Almost surely, 2^20540645 is an apocalyptic number.

It is an amenable number.

20540645 is a deficient number, since it is larger than the sum of its proper divisors (4632859).

20540645 is an equidigital number, since it uses as much as digits as its factorization.

20540645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87459.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20540645 is about 4532.1788358360. The cubic root of 20540645 is about 273.8659413112.

The spelling of 20540645 in words is "twenty million, five hundred forty thousand, six hundred forty-five".