20938512 has 80 divisors (see below), whose sum is σ = 62531712. Its totient is φ = 5913600.

The previous prime is 20938507. The next prime is 20938529. The reversal of 20938512 is 21583902.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20938512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33628 + ... + 34244.

Almost surely, 2^20938512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20938512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31265856).

20938512 is an abundant number, since it is smaller than the sum of its proper divisors (41593200).

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

20938512 is a wasteful number, since it uses less digits than its factorization.

20938512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20938512 is about 4575.8618860276. The cubic root of 20938512 is about 275.6228834017.

The spelling of 20938512 in words is "twenty million, nine hundred thirty-eight thousand, five hundred twelve".