20049677817 has 16 divisors (see below), whose sum is σ = 28961681280. Its totient is φ = 12264377472.

The previous prime is 20049677803. The next prime is 20049677839. The reversal of 20049677817 is 71877694002.

It is not a de Polignac number, because 20049677817 - 2¹¹ = 20049675769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20049677817.

It is not an unprimeable number, because it can be changed into a prime (20049677317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1532692 + ... + 1545717.

It is an arithmetic number, because the mean of its divisors is an integer number (1810105080).

Almost surely, 2^20049677817 is an apocalyptic number.

It is an amenable number.

20049677817 is a deficient number, since it is larger than the sum of its proper divisors (8912003463).

20049677817 is a wasteful number, since it uses less digits than its factorization.

20049677817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078592.

The product of its (nonzero) digits is 1185408, while the sum is 51.

The spelling of 20049677817 in words is "twenty billion, forty-nine million, six hundred seventy-seven thousand, eight hundred seventeen".