20506561752 has 32 divisors (see below), whose sum is σ = 52920161280. Its totient is φ = 6615019680.

The previous prime is 20506561711. The next prime is 20506561759. The reversal of 20506561752 is 25716560502.

It is a self number, because there is not a number n which added to its sum of digits gives 20506561752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506561759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13780548 + ... + 13782035.

It is an arithmetic number, because the mean of its divisors is an integer number (1653755040).

Almost surely, 2^20506561752 is an apocalyptic number.

It is an amenable number.

20506561752 is an abundant number, since it is smaller than the sum of its proper divisors (32413599528).

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

20506561752 is a wasteful number, since it uses less digits than its factorization.

20506561752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27562623 (or 27562619 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 20506561752 in words is "twenty billion, five hundred six million, five hundred sixty-one thousand, seven hundred fifty-two".