20216775026638 has 4 divisors (see below), whose sum is σ = 30325162539960. Its totient is φ = 10108387513318.

The previous prime is 20216775026629. The next prime is 20216775026687. The reversal of 20216775026638 is 83662057761202.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5054193756658 + ... + 5054193756661.

It is an arithmetic number, because the mean of its divisors is an integer number (7581290634990).

Almost surely, 2^{20216775026638} is an apocalyptic number.

20216775026638 is a deficient number, since it is larger than the sum of its proper divisors (10108387513322).

20216775026638 is a wasteful number, since it uses less digits than its factorization.

20216775026638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10108387513321.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 20216775026638 in words is "twenty trillion, two hundred sixteen billion, seven hundred seventy-five million, twenty-six thousand, six hundred thirty-eight".