20819512 has 48 divisors (see below), whose sum is σ = 45821160. Its totient is φ = 8842176.

The previous prime is 20819467. The next prime is 20819521. The reversal of 20819512 is 21591802.

It is a Harshad number since it is a multiple of its sum of digits (28).

20819512 is a modest number, since divided by 19512 gives 208 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67663 + ... + 67969.

Almost surely, 2^20819512 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 20819512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22910580).

20819512 is an abundant number, since it is smaller than the sum of its proper divisors (25001648).

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

20819512 is a wasteful number, since it uses less digits than its factorization.

20819512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 20819512 is about 4562.8403434703. The cubic root of 20819512 is about 275.0997412304.

The spelling of 20819512 in words is "twenty million, eight hundred nineteen thousand, five hundred twelve".