20404279778 has 8 divisors (see below), whose sum is σ = 32217283920. Its totient is φ = 9665185140.

The previous prime is 20404279751. The next prime is 20404279781. The reversal of 20404279778 is 87797240402.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268477328 + ... + 268477403.

It is an arithmetic number, because the mean of its divisors is an integer number (4027160490).

Almost surely, 2^20404279778 is an apocalyptic number.

20404279778 is a deficient number, since it is larger than the sum of its proper divisors (11813004142).

20404279778 is a wasteful number, since it uses less digits than its factorization.

20404279778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536954752.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 20404279778 in words is "twenty billion, four hundred four million, two hundred seventy-nine thousand, seven hundred seventy-eight".