20996201856 has 256 divisors, whose sum is σ = 65292272640. Its totient is φ = 5853978624.

The previous prime is 20996201827. The next prime is 20996201861. The reversal of 20996201856 is 65810269902.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41741701 + ... + 41742203.

It is an arithmetic number, because the mean of its divisors is an integer number (255047940).

Almost surely, 2^20996201856 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 20996201856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32646136320).

20996201856 is an abundant number, since it is smaller than the sum of its proper divisors (44296070784).

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

20996201856 is a wasteful number, since it uses less digits than its factorization.

20996201856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 20996201856 in words is "twenty billion, nine hundred ninety-six million, two hundred one thousand, eight hundred fifty-six".