20855049600 has 768 divisors, whose sum is σ = 86876582400. Its totient is φ = 4271308800.

The previous prime is 20855049587. The next prime is 20855049613. The reversal of 20855049600 is 694055802.

It is an interprime number because it is at equal distance from previous prime (20855049587) and next prime (20855049613).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 65788642 + ... + 65788958.

It is an arithmetic number, because the mean of its divisors is an integer number (113120550).

Almost surely, 2^20855049600 is an apocalyptic number.

20855049600 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 20855049600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43438291200).

20855049600 is an abundant number, since it is smaller than the sum of its proper divisors (66021532800).

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

20855049600 is a wasteful number, since it uses less digits than its factorization.

20855049600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 20855049600 in words is "twenty billion, eight hundred fifty-five million, forty-nine thousand, six hundred".