20620566552 has 64 divisors (see below), whose sum is σ = 52495776000. Its totient is φ = 6747922304.

The previous prime is 20620566541. The next prime is 20620566553. The reversal of 20620566552 is 25566502602.

It is a super-2 number, since 2×20620566552² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20620566552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620566553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1085149 + ... + 1103987.

It is an arithmetic number, because the mean of its divisors is an integer number (820246500).

Almost surely, 2^20620566552 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 20620566552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26247888000).

20620566552 is an abundant number, since it is smaller than the sum of its proper divisors (31875209448).

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

20620566552 is a wasteful number, since it uses less digits than its factorization.

20620566552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19680 (or 19676 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

The spelling of 20620566552 in words is "twenty billion, six hundred twenty million, five hundred sixty-six thousand, five hundred fifty-two".