20556354552 has 32 divisors (see below), whose sum is σ = 51525089280. Its totient is φ = 6834224480.

The previous prime is 20556354529. The next prime is 20556354571. The reversal of 20556354552 is 25545365502.

It is a super-2 number, since 2×20556354552² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1108974 + ... + 1127357.

It is an arithmetic number, because the mean of its divisors is an integer number (1610159040).

Almost surely, 2^20556354552 is an apocalyptic number.

It is an amenable number.

20556354552 is an abundant number, since it is smaller than the sum of its proper divisors (30968734728).

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

20556354552 is a wasteful number, since it uses less digits than its factorization.

20556354552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236723 (or 2236719 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 42.

The spelling of 20556354552 in words is "twenty billion, five hundred fifty-six million, three hundred fifty-four thousand, five hundred fifty-two".