20525983 has 4 divisors (see below), whose sum is σ = 20773368. Its totient is φ = 20278600.

The previous prime is 20525971. The next prime is 20526031. The reversal of 20525983 is 38952502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38952502 = 2 ⋅19476251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20525983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123568 + ... + 123733.

It is an arithmetic number, because the mean of its divisors is an integer number (5193342).

Almost surely, 2^20525983 is an apocalyptic number.

20525983 is a deficient number, since it is larger than the sum of its proper divisors (247385).

20525983 is an equidigital number, since it uses as much as digits as its factorization.

20525983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247384.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 20525983 is about 4530.5610027898. The cubic root of 20525983 is about 273.8007635751.

The spelling of 20525983 in words is "twenty million, five hundred twenty-five thousand, nine hundred eighty-three".