22505402 has 4 divisors (see below), whose sum is σ = 33758106. Its totient is φ = 11252700.

The previous prime is 22505387. The next prime is 22505423. The reversal of 22505402 is 20450522.

22505402 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16008001 + 6497401 = 4001^2 + 2549^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5626349 + ... + 5626352.

Almost surely, 2^22505402 is an apocalyptic number.

22505402 is a deficient number, since it is larger than the sum of its proper divisors (11252704).

22505402 is a wasteful number, since it uses less digits than its factorization.

22505402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11252703.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 22505402 is about 4743.9858768761. The cubic root of 22505402 is about 282.3334000859. Note that the first 3 decimals are identical.

Adding to 22505402 its reverse (20450522), we get a palindrome (42955924).

The spelling of 22505402 in words is "twenty-two million, five hundred five thousand, four hundred two".