20038538 has 16 divisors (see below), whose sum is σ = 32582760. Its totient is φ = 9187776.

The previous prime is 20038531. The next prime is 20038541. The reversal of 20038538 is 83583002.

It can be written as a sum of positive squares in 4 ways, for example, as 17749369 + 2289169 = 4213^2 + 1513^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20038538.

It is not an unprimeable number, because it can be changed into a prime (20038531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1628 + ... + 6536.

Almost surely, 2^20038538 is an apocalyptic number.

20038538 is a deficient number, since it is larger than the sum of its proper divisors (12544222).

20038538 is a wasteful number, since it uses less digits than its factorization.

20038538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5081.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20038538 is about 4476.4425607842. The cubic root of 20038538 is about 271.6159968396.

The spelling of 20038538 in words is "twenty million, thirty-eight thousand, five hundred thirty-eight".