20638027381 has 8 divisors (see below), whose sum is σ = 20803242240. Its totient is φ = 20473470192.

The previous prime is 20638027343. The next prime is 20638027391. The reversal of 20638027381 is 18372083602.

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

It is a cyclic number.

It is not a de Polignac number, because 20638027381 - 2⁷ = 20638027253 is a prime.

It is a super-2 number, since 2×20638027381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638027331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101310 + ... + 227023.

It is an arithmetic number, because the mean of its divisors is an integer number (2600405280).

Almost surely, 2^20638027381 is an apocalyptic number.

It is an amenable number.

20638027381 is a deficient number, since it is larger than the sum of its proper divisors (165214859).

20638027381 is a wasteful number, since it uses less digits than its factorization.

20638027381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328835.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 20638027381 in words is "twenty billion, six hundred thirty-eight million, twenty-seven thousand, three hundred eighty-one".