20545875 has 48 divisors (see below), whose sum is σ = 42344640. Its totient is φ = 9388800.

The previous prime is 20545871. The next prime is 20545883. The reversal of 20545875 is 57854502.

It is a happy number.

20545875 is a `hidden beast` number, since 20 + 54 + 587 + 5 = 666.

It is not a de Polignac number, because 20545875 - 2² = 20545871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20545871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6571 + ... + 9179.

It is an arithmetic number, because the mean of its divisors is an integer number (882180).

Almost surely, 2^20545875 is an apocalyptic number.

20545875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20545875 is an abundant number, since it is smaller than the sum of its proper divisors (21798765).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20545875 is a wasteful number, since it uses less digits than its factorization.

20545875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2637 (or 2624 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 20545875 is about 4532.7557842884. The cubic root of 20545875 is about 273.8891829917.

The spelling of 20545875 in words is "twenty million, five hundred forty-five thousand, eight hundred seventy-five".