19822945 has 4 divisors (see below), whose sum is σ = 23787540. Its totient is φ = 15858352.

The previous prime is 19822897. The next prime is 19822949. The reversal of 19822945 is 54922891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54922891 = 101 ⋅543791.

It can be written as a sum of positive squares in 2 ways, for example, as 15311569 + 4511376 = 3913^2 + 2124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19822945 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19822898 and 19822907.

It is not an unprimeable number, because it can be changed into a prime (19822949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1982290 + ... + 1982299.

It is an arithmetic number, because the mean of its divisors is an integer number (5946885).

Almost surely, 2^19822945 is an apocalyptic number.

It is an amenable number.

19822945 is a deficient number, since it is larger than the sum of its proper divisors (3964595).

19822945 is an equidigital number, since it uses as much as digits as its factorization.

19822945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3964594.

The product of its digits is 51840, while the sum is 40.

The square root of 19822945 is about 4452.2965983861. The cubic root of 19822945 is about 270.6383842566.

The spelling of 19822945 in words is "nineteen million, eight hundred twenty-two thousand, nine hundred forty-five".