20910572139 has 8 divisors (see below), whose sum is σ = 27931735360. Its totient is φ = 13914895176.

The previous prime is 20910572129. The next prime is 20910572201. The reversal of 20910572139 is 93127501902.

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

It is not a de Polignac number, because 20910572139 - 2³³ = 12320637547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20910572097 and 20910572106.

It is not an unprimeable number, because it can be changed into a prime (20910572129) 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, 6369649 + ... + 6372930.

It is an arithmetic number, because the mean of its divisors is an integer number (3491466920).

Almost surely, 2^20910572139 is an apocalyptic number.

20910572139 is a deficient number, since it is larger than the sum of its proper divisors (7021163221).

20910572139 is a wasteful number, since it uses less digits than its factorization.

20910572139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12743129.

The product of its (nonzero) digits is 34020, while the sum is 39.

The spelling of 20910572139 in words is "twenty billion, nine hundred ten million, five hundred seventy-two thousand, one hundred thirty-nine".