20001834 has 12 divisors (see below), whose sum is σ = 43337346. Its totient is φ = 6667272.

The previous prime is 20001833. The next prime is 20001841. The reversal of 20001834 is 43810002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17614809 + 2387025 = 4197^2 + 1545^2 .

It is a Smith number, since the sum of its digits (18) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1111213 = 20001834 / (2 + 0 + 0 + 0 + 1 + 8 + 3 + 4).

It is not an unprimeable number, because it can be changed into a prime (20001833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 555589 + ... + 555624.

Almost surely, 2^20001834 is an apocalyptic number.

20001834 is an abundant number, since it is smaller than the sum of its proper divisors (23335512).

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

20001834 is a wasteful number, since it uses less digits than its factorization.

20001834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111221 (or 1111218 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20001834 is about 4472.3409977326. The cubic root of 20001834 is about 271.4500584757.

Adding to 20001834 its reverse (43810002), we get a palindrome (63811836).

The spelling of 20001834 in words is "twenty million, one thousand, eight hundred thirty-four".