20250985 has 4 divisors (see below), whose sum is σ = 24301188. Its totient is φ = 16200784.

The previous prime is 20250947. The next prime is 20250991. The reversal of 20250985 is 58905202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58905202 = 2 ⋅29452601.

It can be written as a sum of positive squares in 2 ways, for example, as 4853209 + 15397776 = 2203^2 + 3924^2 .

It is a cyclic number.

It is not a de Polignac number, because 20250985 - 2⁹ = 20250473 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2025094 + ... + 2025103.

It is an arithmetic number, because the mean of its divisors is an integer number (6075297).

Almost surely, 2^20250985 is an apocalyptic number.

It is an amenable number.

20250985 is a deficient number, since it is larger than the sum of its proper divisors (4050203).

20250985 is an equidigital number, since it uses as much as digits as its factorization.

20250985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050202.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 20250985 is about 4500.1094431136. The cubic root of 20250985 is about 272.5725082699.

The spelling of 20250985 in words is "twenty million, two hundred fifty thousand, nine hundred eighty-five".