20051451139 has 4 divisors (see below), whose sum is σ = 20152212400. Its totient is φ = 19950689880.

The previous prime is 20051451011. The next prime is 20051451209. The reversal of 20051451139 is 93115415002.

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

It is a cyclic number.

It is not a de Polignac number, because 20051451139 - 2⁷ = 20051451011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20051451139.

It is not an unprimeable number, because it can be changed into a prime (20051451239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50380332 + ... + 50380729.

It is an arithmetic number, because the mean of its divisors is an integer number (5038053100).

Almost surely, 2^20051451139 is an apocalyptic number.

20051451139 is a deficient number, since it is larger than the sum of its proper divisors (100761261).

20051451139 is a wasteful number, since it uses less digits than its factorization.

20051451139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100761260.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 20051451139 in words is "twenty billion, fifty-one million, four hundred fifty-one thousand, one hundred thirty-nine".