20531766700 has 108 divisors (see below), whose sum is σ = 48026738592. Its totient is φ = 7614288000.

The previous prime is 20531766641. The next prime is 20531766701. The reversal of 20531766700 is 766713502.

It is a self number, because there is not a number n which added to its sum of digits gives 20531766700.

It is not an unprimeable number, because it can be changed into a prime (20531766701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1690650 + ... + 1702750.

It is an arithmetic number, because the mean of its divisors is an integer number (444692024).

Almost surely, 2^20531766700 is an apocalyptic number.

20531766700 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 20531766700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24013369296).

20531766700 is an abundant number, since it is smaller than the sum of its proper divisors (27494971892).

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

20531766700 is a wasteful number, since it uses less digits than its factorization.

20531766700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12200 (or 12174 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 37.

The spelling of 20531766700 in words is "twenty billion, five hundred thirty-one million, seven hundred sixty-six thousand, seven hundred".