20000538 has 36 divisors (see below), whose sum is σ = 44484414. Its totient is φ = 6494400.

The previous prime is 20000537. The next prime is 20000543. The reversal of 20000538 is 83500002.

It can be written as a sum of positive squares in 3 ways, for example, as 9715689 + 10284849 = 3117^2 + 3207^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20000538.

It is not an unprimeable number, because it can be changed into a prime (20000531) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 29928 + ... + 30588.

Almost surely, 2^20000538 is an apocalyptic number.

20000538 is an abundant number, since it is smaller than the sum of its proper divisors (24483876).

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

20000538 is a wasteful number, since it uses less digits than its factorization.

20000538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20000538 is about 4472.1961048237. The cubic root of 20000538 is about 271.4441955655. Note that the first 3 decimals are identical.

The spelling of 20000538 in words is "twenty million, five hundred thirty-eight", and thus it is an aban number.