20806733520 has 160 divisors (see below), whose sum is σ = 71714160000. Its totient is φ = 5544861696.

The previous prime is 20806733509. The next prime is 20806733527. The reversal of 20806733520 is 2533760802.

20806733520 is a `hidden beast` number, since 20 + 80 + 6 + 7 + 33 + 520 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806733527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5944731 + ... + 5948229.

It is an arithmetic number, because the mean of its divisors is an integer number (448213500).

Almost surely, 2^20806733520 is an apocalyptic number.

20806733520 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 20806733520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35857080000).

20806733520 is an abundant number, since it is smaller than the sum of its proper divisors (50907426480).

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

20806733520 is a wasteful number, since it uses less digits than its factorization.

20806733520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6274 (or 6262 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 20806733520 in words is "twenty billion, eight hundred six million, seven hundred thirty-three thousand, five hundred twenty".