20561454396 has 120 divisors (see below), whose sum is σ = 61808503680. Its totient is φ = 5838555168.

The previous prime is 20561454373. The next prime is 20561454439. The reversal of 20561454396 is 69345416502.

20561454396 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 14 + 543 + 96 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 341875 + ... + 397493.

It is an arithmetic number, because the mean of its divisors is an integer number (515070864).

Almost surely, 2^20561454396 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 20561454396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30904251840).

20561454396 is an abundant number, since it is smaller than the sum of its proper divisors (41247049284).

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

20561454396 is a wasteful number, since it uses less digits than its factorization.

20561454396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55805 (or 55794 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 20561454396 in words is "twenty billion, five hundred sixty-one million, four hundred fifty-four thousand, three hundred ninety-six".