20542585 has 32 divisors (see below), whose sum is σ = 29986560. Its totient is φ = 13208832.

The previous prime is 20542573. The next prime is 20542589. The reversal of 20542585 is 58524502.

20542585 = T₆₃ + T₆₄ + ... + T₄₉₇.

It is not a de Polignac number, because 20542585 - 2⁹ = 20542073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20542589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37282 + ... + 37828.

It is an arithmetic number, because the mean of its divisors is an integer number (937080).

Almost surely, 2^20542585 is an apocalyptic number.

It is an amenable number.

20542585 is a deficient number, since it is larger than the sum of its proper divisors (9443975).

20542585 is a wasteful number, since it uses less digits than its factorization.

20542585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625.

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 20542585 is about 4532.3928558765. The cubic root of 20542585 is about 273.8745629684.

The spelling of 20542585 in words is "twenty million, five hundred forty-two thousand, five hundred eighty-five".