20561024120 has 128 divisors (see below), whose sum is σ = 57066387840. Its totient is φ = 6492579840.

The previous prime is 20561024111. The next prime is 20561024123. The reversal of 20561024120 is 2142016502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20561024123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1671914 + ... + 1684166.

It is an arithmetic number, because the mean of its divisors is an integer number (445831155).

Almost surely, 2^20561024120 is an apocalyptic number.

20561024120 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 20561024120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28533193920).

20561024120 is an abundant number, since it is smaller than the sum of its proper divisors (36505363720).

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

20561024120 is a wasteful number, since it uses less digits than its factorization.

20561024120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12745 (or 12741 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The spelling of 20561024120 in words is "twenty billion, five hundred sixty-one million, twenty-four thousand, one hundred twenty".