20684198454 has 8 divisors (see below), whose sum is σ = 41368396920. Its totient is φ = 6894732816.

The previous prime is 20684198429. The next prime is 20684198461. The reversal of 20684198454 is 45489148602.

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

20684198454 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20684198397 and 20684198406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1723683199 + ... + 1723683210.

It is an arithmetic number, because the mean of its divisors is an integer number (5171049615).

Almost surely, 2^20684198454 is an apocalyptic number.

20684198454 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20684198454 is a wasteful number, since it uses less digits than its factorization.

20684198454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447366414.

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 20684198454 in words is "twenty billion, six hundred eighty-four million, one hundred ninety-eight thousand, four hundred fifty-four".