20438893932538 has 8 divisors (see below), whose sum is σ = 30658460155488. Its totient is φ = 10219407214044.

The previous prime is 20438893932517. The next prime is 20438893932539. The reversal of 20438893932538 is 83523939883402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20438893932539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19229206 + ... + 20264257.

It is an arithmetic number, because the mean of its divisors is an integer number (3832307519436).

Almost surely, 2^{20438893932538} is an apocalyptic number.

20438893932538 is a deficient number, since it is larger than the sum of its proper divisors (10219566222950).

20438893932538 is a wasteful number, since it uses less digits than its factorization.

20438893932538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39752228.

The product of its (nonzero) digits is 268738560, while the sum is 67.

The spelling of 20438893932538 in words is "twenty trillion, four hundred thirty-eight billion, eight hundred ninety-three million, nine hundred thirty-two thousand, five hundred thirty-eight".