20009250 has 48 divisors (see below), whose sum is σ = 54111096. Its totient is φ = 5335200.

The previous prime is 20009243. The next prime is 20009273. The reversal of 20009250 is 5290002.

It can be written as a sum of positive squares in 4 ways, for example, as 2595321 + 17413929 = 1611^2 + 4173^2 .

It is a super-3 number, since 3×20009250³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2197 + ... + 6696.

Almost surely, 2^20009250 is an apocalyptic number.

20009250 is an abundant number, since it is smaller than the sum of its proper divisors (34101846).

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

20009250 is a wasteful number, since it uses less digits than its factorization.

20009250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8916 (or 8903 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20009250 is about 4473.1700168896. The cubic root of 20009250 is about 271.4836024813.

Adding to 20009250 its reverse (5290002), we get a palindrome (25299252).

The spelling of 20009250 in words is "twenty million, nine thousand, two hundred fifty".