20645650332 has 168 divisors, whose sum is σ = 55928932416. Its totient is φ = 6661730304.

The previous prime is 20645650331. The next prime is 20645650349. The reversal of 20645650332 is 23305654602.

20645650332 is a `hidden beast` number, since 2 + 0 + 64 + 565 + 0 + 3 + 32 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645650331) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 13293268 + ... + 13294820.

It is an arithmetic number, because the mean of its divisors is an integer number (332910312).

Almost surely, 2^20645650332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20645650332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27964466208).

20645650332 is an abundant number, since it is smaller than the sum of its proper divisors (35283282084).

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

20645650332 is a wasteful number, since it uses less digits than its factorization.

20645650332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The spelling of 20645650332 in words is "twenty billion, six hundred forty-five million, six hundred fifty thousand, three hundred thirty-two".