20511152 has 20 divisors (see below), whose sum is σ = 40710936. Its totient is φ = 10005120.

The previous prime is 20511143. The next prime is 20511157. The reversal of 20511152 is 25111502.

It is a self number, because there is not a number n which added to its sum of digits gives 20511152.

It is not an unprimeable number, because it can be changed into a prime (20511157) 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, 14978 + ... + 16289.

Almost surely, 2^20511152 is an apocalyptic number.

It is an amenable number.

20511152 is a deficient number, since it is larger than the sum of its proper divisors (20199784).

20511152 is a wasteful number, since it uses less digits than its factorization.

20511152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31316 (or 31310 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 20511152 is about 4528.9239340046. The cubic root of 20511152 is about 273.7348029900.

Adding to 20511152 its reverse (25111502), we get a palindrome (45622654).

The spelling of 20511152 in words is "twenty million, five hundred eleven thousand, one hundred fifty-two".