20765559552 has 144 divisors (see below), whose sum is σ = 56618472960. Its totient is φ = 6753488896.

The previous prime is 20765559541. The next prime is 20765559569. The reversal of 20765559552 is 25595556702.

It is a junction number, because it is equal to n+sod(n) for n = 20765559495 and 20765559504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15123538 + ... + 15124910.

It is an arithmetic number, because the mean of its divisors is an integer number (393183840).

Almost surely, 2^20765559552 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 20765559552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28309236480).

20765559552 is an abundant number, since it is smaller than the sum of its proper divisors (35852913408).

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

20765559552 is a wasteful number, since it uses less digits than its factorization.

20765559552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858 (or 1844 counting only the distinct ones).

The product of its (nonzero) digits is 4725000, while the sum is 51.

The spelling of 20765559552 in words is "twenty billion, seven hundred sixty-five million, five hundred fifty-nine thousand, five hundred fifty-two".