20181850 has 48 divisors (see below), whose sum is σ = 41169240. Its totient is φ = 7315200.

The previous prime is 20181823. The next prime is 20181851. The reversal of 20181850 is 5818102.

It can be written as a sum of positive squares in 12 ways, for example, as 120409 + 20061441 = 347^2 + 4479^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20181851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39396 + ... + 39904.

Almost surely, 2^20181850 is an apocalyptic number.

20181850 is an abundant number, since it is smaller than the sum of its proper divisors (20987390).

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

20181850 is a wasteful number, since it uses less digits than its factorization.

20181850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 20181850 is about 4492.4213960847. The cubic root of 20181850 is about 272.2619754677.

Adding to 20181850 its reverse (5818102), we get a palindrome (25999952).

The spelling of 20181850 in words is "twenty million, one hundred eighty-one thousand, eight hundred fifty".