20858421939 has 8 divisors (see below), whose sum is σ = 29274978240. Its totient is φ = 13173740136.

The previous prime is 20858421937. The next prime is 20858421967. The reversal of 20858421939 is 93912485802.

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

It is not a de Polignac number, because 20858421939 - 2¹ = 20858421937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20858421891 and 20858421900.

It is not an unprimeable number, because it can be changed into a prime (20858421931) 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, 182968557 + ... + 182968670.

It is an arithmetic number, because the mean of its divisors is an integer number (3659372280).

Almost surely, 2^20858421939 is an apocalyptic number.

20858421939 is a deficient number, since it is larger than the sum of its proper divisors (8416556301).

20858421939 is a wasteful number, since it uses less digits than its factorization.

20858421939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365937249.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 20858421939 in words is "twenty billion, eight hundred fifty-eight million, four hundred twenty-one thousand, nine hundred thirty-nine".