19822840 has 16 divisors (see below), whose sum is σ = 44601480. Its totient is φ = 7929120.

The previous prime is 19822819. The next prime is 19822841. The reversal of 19822840 is 4822891.

It is a junction number, because it is equal to n+sod(n) for n = 19822796 and 19822805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19822841) 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, 247746 + ... + 247825.

Almost surely, 2^19822840 is an apocalyptic number.

19822840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19822840 is an abundant number, since it is smaller than the sum of its proper divisors (24778640).

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

19822840 is a wasteful number, since it uses less digits than its factorization.

19822840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495582 (or 495578 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 19822840 is about 4452.2848067032. The cubic root of 19822840 is about 270.6379064083.

The spelling of 19822840 in words is "nineteen million, eight hundred twenty-two thousand, eight hundred forty".