20645352 has 192 divisors, whose sum is σ = 72334080. Its totient is φ = 5170176.

The previous prime is 20645347. The next prime is 20645399. The reversal of 20645352 is 25354602.

20645352 is a `hidden beast` number, since 206 + 453 + 5 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150628 + ... + 150764.

It is an arithmetic number, because the mean of its divisors is an integer number (376740).

Almost surely, 2^20645352 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 20645352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36167040).

20645352 is an abundant number, since it is smaller than the sum of its proper divisors (51688728).

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

20645352 is a wasteful number, since it uses less digits than its factorization.

20645352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20645352 is about 4543.7156601178. The cubic root of 20645352 is about 274.3305014290.

Adding to 20645352 its reverse (25354602), we get a palindrome (45999954).

The spelling of 20645352 in words is "twenty million, six hundred forty-five thousand, three hundred fifty-two".