19825812 has 18 divisors (see below), whose sum is σ = 50115338. Its totient is φ = 6608592.

The previous prime is 19825811. The next prime is 19825849. The reversal of 19825812 is 21852891.

It can be written as a sum of positive squares in only one way, i.e., 11737476 + 8088336 = 3426^2 + 2844^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 550717 = 19825812 / (1 + 9 + 8 + 2 + 5 + 8 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19825811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275323 + ... + 275394.

Almost surely, 2^19825812 is an apocalyptic number.

19825812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19825812 is an abundant number, since it is smaller than the sum of its proper divisors (30289526).

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

19825812 is a wasteful number, since it uses less digits than its factorization.

19825812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550727 (or 550722 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 19825812 is about 4452.6185554121. The cubic root of 19825812 is about 270.6514311381.

The spelling of 19825812 in words is "nineteen million, eight hundred twenty-five thousand, eight hundred twelve".