20819472 has 80 divisors (see below), whose sum is σ = 56246400. Its totient is φ = 6630400.

The previous prime is 20819467. The next prime is 20819521. The reversal of 20819472 is 27491802.

It is a happy number.

It is a congruent number.

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, 139654 + ... + 139802.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^20819472 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 20819472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28123200).

20819472 is an abundant number, since it is smaller than the sum of its proper divisors (35426928).

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

20819472 is a wasteful number, since it uses less digits than its factorization.

20819472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20819472 is about 4562.8359602335. The cubic root of 20819472 is about 275.0995650496.

The spelling of 20819472 in words is "twenty million, eight hundred nineteen thousand, four hundred seventy-two".