20533835856 has 80 divisors (see below), whose sum is σ = 55869709824. Its totient is φ = 6485795712.

The previous prime is 20533835827. The next prime is 20533835887. The reversal of 20533835856 is 65853833502.

It is a super-2 number, since 2×20533835856² (a number of 21 digits) contains 22 as substring.

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 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, 31215 + ... + 205041.

Almost surely, 2^20533835856 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 20533835856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27934854912).

20533835856 is an abundant number, since it is smaller than the sum of its proper divisors (35335873968).

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

20533835856 is a wasteful number, since it uses less digits than its factorization.

20533835856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173968 (or 173962 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 20533835856 in words is "twenty billion, five hundred thirty-three million, eight hundred thirty-five thousand, eight hundred fifty-six".