20561326632 has 256 divisors, whose sum is σ = 71481139200. Its totient is φ = 5320131840.

The previous prime is 20561326613. The next prime is 20561326633. The reversal of 20561326632 is 23662316502.

20561326632 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 13 + 2 + 6 + 632 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20561326633) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4604833 + ... + 4609295.

It is an arithmetic number, because the mean of its divisors is an integer number (279223200).

Almost surely, 2^20561326632 is an apocalyptic number.

20561326632 is a gapful number since it is divisible by the number (22) 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 20561326632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35740569600).

20561326632 is an abundant number, since it is smaller than the sum of its proper divisors (50919812568).

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

20561326632 is a wasteful number, since it uses less digits than its factorization.

20561326632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4773 (or 4763 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 20561326632 in words is "twenty billion, five hundred sixty-one million, three hundred twenty-six thousand, six hundred thirty-two".