20525638 has 8 divisors (see below), whose sum is σ = 35186832. Its totient is φ = 8796696.

The previous prime is 20525633. The next prime is 20525653. The reversal of 20525638 is 83652502.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 733045 + ... + 733072.

It is an arithmetic number, because the mean of its divisors is an integer number (4398354).

Almost surely, 2^20525638 is an apocalyptic number.

20525638 is a deficient number, since it is larger than the sum of its proper divisors (14661194).

20525638 is a wasteful number, since it uses less digits than its factorization.

20525638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466126.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20525638 is about 4530.5229278749. The cubic root of 20525638 is about 273.7992295553.

The spelling of 20525638 in words is "twenty million, five hundred twenty-five thousand, six hundred thirty-eight".