20840702256 has 120 divisors (see below), whose sum is σ = 64499260176. Its totient is φ = 6228817920.

The previous prime is 20840702191. The next prime is 20840702257. The reversal of 20840702256 is 65220704802.

20840702256 is a `hidden beast` number, since 20 + 8 + 407 + 0 + 225 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20840702256.

It is not an unprimeable number, because it can be changed into a prime (20840702257) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25516 + ... + 205748.

Almost surely, 2^20840702256 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 20840702256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32249630088).

20840702256 is an abundant number, since it is smaller than the sum of its proper divisors (43658557920).

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

20840702256 is a wasteful number, since it uses less digits than its factorization.

20840702256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180331 (or 180322 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 20840702256 in words is "twenty billion, eight hundred forty million, seven hundred two thousand, two hundred fifty-six".