20654890899456 has 384 divisors, whose sum is σ = 64776442348800. Its totient is φ = 5784993792000.

The previous prime is 20654890899449. The next prime is 20654890899463. The reversal of 20654890899456 is 65499809845602.

It is an interprime number because it is at equal distance from previous prime (20654890899449) and next prime (20654890899463).

It is a tau number, because it is divible by the number of its divisors (384).

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 31 ways as a sum of consecutive naturals, for example, 52451776 + ... + 52844096.

It is an arithmetic number, because the mean of its divisors is an integer number (168688651950).

Almost surely, 2^{20654890899456} 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 20654890899456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32388221174400).

20654890899456 is an abundant number, since it is smaller than the sum of its proper divisors (44121551449344).

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

20654890899456 is a wasteful number, since it uses less digits than its factorization.

20654890899456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392417 (or 392397 counting only the distinct ones).

The product of its (nonzero) digits is 1343692800, while the sum is 75.

The spelling of 20654890899456 in words is "twenty trillion, six hundred fifty-four billion, eight hundred ninety million, eight hundred ninety-nine thousand, four hundred fifty-six".