20725312 has 56 divisors (see below), whose sum is σ = 44659296. Its totient is φ = 9504768.

The previous prime is 20725307. The next prime is 20725337. The reversal of 20725312 is 21352702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46563 + ... + 47005.

Almost surely, 2^20725312 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 20725312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22329648).

20725312 is an abundant number, since it is smaller than the sum of its proper divisors (23933984).

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

20725312 is a wasteful number, since it uses less digits than its factorization.

20725312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20725312 is about 4552.5061230052. The cubic root of 20725312 is about 274.6842083035.

The spelling of 20725312 in words is "twenty million, seven hundred twenty-five thousand, three hundred twelve".