20934385904454 has 192 divisors, whose sum is σ = 48640173539328. Its totient is φ = 5955134644800.

The previous prime is 20934385904381. The next prime is 20934385904483. The reversal of 20934385904454 is 45440958343902.

It is a happy number.

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 95 ways as a sum of consecutive naturals, for example, 633916987 + ... + 633950009.

It is an arithmetic number, because the mean of its divisors is an integer number (253334237184).

Almost surely, 2^{20934385904454} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20934385904454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24320086769664).

20934385904454 is an abundant number, since it is smaller than the sum of its proper divisors (27705787634874).

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

20934385904454 is a wasteful number, since it uses less digits than its factorization.

20934385904454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33423 (or 33400 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 60.

The spelling of 20934385904454 in words is "twenty trillion, nine hundred thirty-four billion, three hundred eighty-five million, nine hundred four thousand, four hundred fifty-four".