20620655320 has 64 divisors (see below), whose sum is σ = 48106872000. Its totient is φ = 7945502208.

The previous prime is 20620655317. The next prime is 20620655329. The reversal of 20620655320 is 2355602602.

It is a super-2 number, since 2×20620655320² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620655329) by changing a digit.

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, 488994 + ... + 529486.

It is an arithmetic number, because the mean of its divisors is an integer number (751669875).

Almost surely, 2^20620655320 is an apocalyptic number.

20620655320 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 20620655320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24053436000).

20620655320 is an abundant number, since it is smaller than the sum of its proper divisors (27486216680).

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

20620655320 is a wasteful number, since it uses less digits than its factorization.

20620655320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40972 (or 40968 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 20620655320 in words is "twenty billion, six hundred twenty million, six hundred fifty-five thousand, three hundred twenty".