20402522 has 12 divisors (see below), whose sum is σ = 35600490. Its totient is φ = 8743896.

The previous prime is 20402521. The next prime is 20402531. The reversal of 20402522 is 22520402.

It can be written as a sum of positive squares in only one way, i.e., 19882681 + 519841 = 4459^2 + 721^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20402522.

It is not an unprimeable number, because it can be changed into a prime (20402521) 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 5 ways as a sum of consecutive naturals, for example, 103997 + ... + 104192.

Almost surely, 2^20402522 is an apocalyptic number.

20402522 is a deficient number, since it is larger than the sum of its proper divisors (15197968).

20402522 is a wasteful number, since it uses less digits than its factorization.

20402522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208205 (or 208198 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20402522 is about 4516.9150977188. The cubic root of 20402522 is about 273.2507011107.

Adding to 20402522 its reverse (22520402), we get a palindrome (42922924).

The spelling of 20402522 in words is "twenty million, four hundred two thousand, five hundred twenty-two".