20725630 has 8 divisors (see below), whose sum is σ = 37306152. Its totient is φ = 8290248.

The previous prime is 20725619. The next prime is 20725631. The reversal of 20725630 is 3652702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20725595 and 20725604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036272 + ... + 1036291.

It is an arithmetic number, because the mean of its divisors is an integer number (4663269).

Almost surely, 2^20725630 is an apocalyptic number.

20725630 is a deficient number, since it is larger than the sum of its proper divisors (16580522).

20725630 is a wasteful number, since it uses less digits than its factorization.

20725630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072570.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20725630 is about 4552.5410486892. The cubic root of 20725630 is about 274.6856131739.

The spelling of 20725630 in words is "twenty million, seven hundred twenty-five thousand, six hundred thirty".