20500638 has 8 divisors (see below), whose sum is σ = 41001288. Its totient is φ = 6833544.

The previous prime is 20500631. The next prime is 20500643. The reversal of 20500638 is 83600502.

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

20500638 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1708381 + ... + 1708392.

It is an arithmetic number, because the mean of its divisors is an integer number (5125161).

Almost surely, 2^20500638 is an apocalyptic number.

20500638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20500638 is a wasteful number, since it uses less digits than its factorization.

20500638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3416778.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20500638 is about 4527.7630238342. The cubic root of 20500638 is about 273.6880229161.

The spelling of 20500638 in words is "twenty million, five hundred thousand, six hundred thirty-eight".