20210768656 has 80 divisors (see below), whose sum is σ = 44146174464. Its totient is φ = 8893665792.

The previous prime is 20210768647. The next prime is 20210768693. The reversal of 20210768656 is 65686701202.

It is a super-3 number, since 3×20210768656³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1509865 + ... + 1523191.

Almost surely, 2^20210768656 is an apocalyptic number.

20210768656 is a gapful number since it is divisible by the number (26) 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 20210768656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22073087232).

20210768656 is an abundant number, since it is smaller than the sum of its proper divisors (23935405808).

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

20210768656 is a wasteful number, since it uses less digits than its factorization.

20210768656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13688 (or 13682 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 20210768656 in words is "twenty billion, two hundred ten million, seven hundred sixty-eight thousand, six hundred fifty-six".