20542577 has 8 divisors (see below), whose sum is σ = 22537440. Its totient is φ = 18568960.

The previous prime is 20542573. The next prime is 20542589. The reversal of 20542577 is 77524502.

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 20542577 - 2² = 20542573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20542573) 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, 3248 + ... + 7185.

It is an arithmetic number, because the mean of its divisors is an integer number (2817180).

Almost surely, 2^20542577 is an apocalyptic number.

It is an amenable number.

20542577 is a deficient number, since it is larger than the sum of its proper divisors (1994863).

20542577 is a wasteful number, since it uses less digits than its factorization.

20542577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10623.

The product of its (nonzero) digits is 19600, while the sum is 32.

The square root of 20542577 is about 4532.3919733403. The cubic root of 20542577 is about 273.8745274163.

It can be divided in two parts, 205425 and 77, that added together give a palindrome (205502).

The spelling of 20542577 in words is "twenty million, five hundred forty-two thousand, five hundred seventy-seven".