20535745 has 8 divisors (see below), whose sum is σ = 26092584. Its totient is φ = 15462144.

The previous prime is 20535737. The next prime is 20535791. The reversal of 20535745 is 54753502.

It can be written as a sum of positive squares in 4 ways, for example, as 186624 + 20349121 = 432^2 + 4511^2 .

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 20535745 - 2³ = 20535737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120714 + ... + 120883.

It is an arithmetic number, because the mean of its divisors is an integer number (3261573).

Almost surely, 2^20535745 is an apocalyptic number.

It is an amenable number.

20535745 is a deficient number, since it is larger than the sum of its proper divisors (5556839).

20535745 is a wasteful number, since it uses less digits than its factorization.

20535745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241619.

The product of its (nonzero) digits is 21000, while the sum is 31.

The square root of 20535745 is about 4531.6382247483. The cubic root of 20535745 is about 273.8441625431.

The spelling of 20535745 in words is "twenty million, five hundred thirty-five thousand, seven hundred forty-five".