20819522 has 4 divisors (see below), whose sum is σ = 31229286. Its totient is φ = 10409760.

The previous prime is 20819521. The next prime is 20819563. The reversal of 20819522 is 22591802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22591802 = 2 ⋅11295901.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 398161 = 4519^2 + 631^2 .

It is not an unprimeable number, because it can be changed into a prime (20819521) 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 as a sum of consecutive naturals, namely, 5204879 + ... + 5204882.

Almost surely, 2^20819522 is an apocalyptic number.

20819522 is a deficient number, since it is larger than the sum of its proper divisors (10409764).

20819522 is a wasteful number, since it uses less digits than its factorization.

20819522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10409763.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20819522 is about 4562.8414392788. The cubic root of 20819522 is about 275.0997852756.

The spelling of 20819522 in words is "twenty million, eight hundred nineteen thousand, five hundred twenty-two".