20725156 has 12 divisors (see below), whose sum is σ = 36337392. Its totient is φ = 10343048.

The previous prime is 20725153. The next prime is 20725171. The reversal of 20725156 is 65152702.

It is not an unprimeable number, because it can be changed into a prime (20725153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2350 + ... + 6853.

It is an arithmetic number, because the mean of its divisors is an integer number (3028116).

Almost surely, 2^20725156 is an apocalyptic number.

It is an amenable number.

20725156 is a deficient number, since it is larger than the sum of its proper divisors (15612236).

20725156 is a wasteful number, since it uses less digits than its factorization.

20725156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9770 (or 9768 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 20725156 is about 4552.4889895529. The cubic root of 20725156 is about 274.6835191166.

Adding to 20725156 its reverse (65152702), we get a palindrome (85877858).

The spelling of 20725156 in words is "twenty million, seven hundred twenty-five thousand, one hundred fifty-six".