20678726454 has 16 divisors (see below), whose sum is σ = 41374206192. Its totient is φ = 6890116608.

The previous prime is 20678726429. The next prime is 20678726461. The reversal of 20678726454 is 45462787602.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20678726397 and 20678726406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681979 + ... + 711654.

It is an arithmetic number, because the mean of its divisors is an integer number (2585887887).

Almost surely, 2^20678726454 is an apocalyptic number.

20678726454 is an abundant number, since it is smaller than the sum of its proper divisors (20695479738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20678726454 is a wasteful number, since it uses less digits than its factorization.

20678726454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396111.

The product of its (nonzero) digits is 4515840, while the sum is 51.

The spelling of 20678726454 in words is "twenty billion, six hundred seventy-eight million, seven hundred twenty-six thousand, four hundred fifty-four".