20636028638 has 8 divisors (see below), whose sum is σ = 30971645760. Its totient is φ = 10312146720.

The previous prime is 20636028619. The next prime is 20636028659. The reversal of 20636028638 is 83682063602.

It is a happy number.

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

It is a super-2 number, since 2×20636028638² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2929403 + ... + 2936438.

It is an arithmetic number, because the mean of its divisors is an integer number (3871455720).

Almost surely, 2^20636028638 is an apocalyptic number.

20636028638 is a deficient number, since it is larger than the sum of its proper divisors (10335617122).

20636028638 is a wasteful number, since it uses less digits than its factorization.

20636028638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5867602.

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 20636028638 in words is "twenty billion, six hundred thirty-six million, twenty-eight thousand, six hundred thirty-eight".