20204354779 has 12 divisors (see below), whose sum is σ = 23621142000. Its totient is φ = 17230984848.

The previous prime is 20204354771. The next prime is 20204354801. The reversal of 20204354779 is 97745340202.

It is not a de Polignac number, because 20204354779 - 2³ = 20204354771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20204354771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1026264 + ... + 1045765.

It is an arithmetic number, because the mean of its divisors is an integer number (1968428500).

Almost surely, 2^20204354779 is an apocalyptic number.

20204354779 is a deficient number, since it is larger than the sum of its proper divisors (3416787221).

20204354779 is a wasteful number, since it uses less digits than its factorization.

20204354779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072242 (or 2072235 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 20204354779 in words is "twenty billion, two hundred four million, three hundred fifty-four thousand, seven hundred seventy-nine".