20604866664668 has 48 divisors (see below), whose sum is σ = 42368515746144. Its totient is φ = 8644161335040.

The previous prime is 20604866664617. The next prime is 20604866664673. The reversal of 20604866664668 is 86646666840602.

It is a junction number, because it is equal to n+sod(n) for n = 20604866664598 and 20604866664607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1428146 + ... + 6576422.

It is an arithmetic number, because the mean of its divisors is an integer number (882677411378).

Almost surely, 2^{20604866664668} is an apocalyptic number.

It is an amenable number.

20604866664668 is an abundant number, since it is smaller than the sum of its proper divisors (21763649081476).

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

20604866664668 is a wasteful number, since it uses less digits than its factorization.

20604866664668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155302 (or 5155300 counting only the distinct ones).

The product of its (nonzero) digits is 573308928, while the sum is 68.

The spelling of 20604866664668 in words is "twenty trillion, six hundred four billion, eight hundred sixty-six million, six hundred sixty-four thousand, six hundred sixty-eight".