20556515000 has 160 divisors (see below), whose sum is σ = 55198830720. Its totient is φ = 7028208000.

The previous prime is 20556514981. The next prime is 20556515033. The reversal of 20556515000 is 51565502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18304439 + ... + 18305561.

It is an arithmetic number, because the mean of its divisors is an integer number (344992692).

Almost surely, 2^20556515000 is an apocalyptic number.

20556515000 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 20556515000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27599415360).

20556515000 is an abundant number, since it is smaller than the sum of its proper divisors (34642315720).

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

20556515000 is a wasteful number, since it uses less digits than its factorization.

20556515000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679 (or 1660 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 20556515000 in words is "twenty billion, five hundred fifty-six million, five hundred fifteen thousand".