20466604944816 has 80 divisors (see below), whose sum is σ = 54596889384960. Its totient is φ = 6599798830080.

The previous prime is 20466604944763. The next prime is 20466604944829. The reversal of 20466604944816 is 61844940666402.

It is a self number, because there is not a number n which added to its sum of digits gives 20466604944816.

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, 1787965 + ... + 6643043.

It is an arithmetic number, because the mean of its divisors is an integer number (682461117312).

Almost surely, 2^{20466604944816} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20466604944816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27298444692480).

20466604944816 is an abundant number, since it is smaller than the sum of its proper divisors (34130284440144).

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

20466604944816 is a wasteful number, since it uses less digits than its factorization.

20466604944816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4857954 (or 4857948 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 60.

The spelling of 20466604944816 in words is "twenty trillion, four hundred sixty-six billion, six hundred four million, nine hundred forty-four thousand, eight hundred sixteen".