20694478356480 has 320 divisors, whose sum is σ = 66517235928000. Its totient is φ = 5493951037440.

The previous prime is 20694478356457. The next prime is 20694478356547. The reversal of 20694478356480 is 8465387449602.

It is a tau number, because it is divible by the number of its divisors (320).

It is a super-2 number, since 2×20694478356480² (a number of 27 digits) contains 22 as substring.

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, 1800923535 + ... + 1800935025.

It is an arithmetic number, because the mean of its divisors is an integer number (207866362275).

Almost surely, 2^{20694478356480} is an apocalyptic number.

20694478356480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20694478356480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33258617964000).

20694478356480 is an abundant number, since it is smaller than the sum of its proper divisors (45822757571520).

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

20694478356480 is an frugal number, since it uses more digits than its factorization.

20694478356480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11766 (or 11730 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 66.

The spelling of 20694478356480 in words is "twenty trillion, six hundred ninety-four billion, four hundred seventy-eight million, three hundred fifty-six thousand, four hundred eighty".