20671875 has 84 divisors (see below), whose sum is σ = 44530680. Its totient is φ = 9450000.

The previous prime is 20671873. The next prime is 20671879. The reversal of 20671875 is 57817602.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 20671875 - 2¹ = 20671873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20671873) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 2953122 + ... + 2953128.

Almost surely, 2^20671875 is an apocalyptic number.

20671875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20671875 is an abundant number, since it is smaller than the sum of its proper divisors (23858805).

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

20671875 is an frugal number, since it uses more digits than its factorization.

20671875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53 (or 15 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 20671875 is about 4546.6333698683. The cubic root of 20671875 is about 274.4479282517.

The spelling of 20671875 in words is "twenty million, six hundred seventy-one thousand, eight hundred seventy-five".