20490122 has 4 divisors (see below), whose sum is σ = 30735186. Its totient is φ = 10245060.

The previous prime is 20490121. The next prime is 20490133. The reversal of 20490122 is 22109402.

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., 13097161 + 7392961 = 3619^2 + 2719^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20490094 and 20490103.

It is not an unprimeable number, because it can be changed into a prime (20490121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5122529 + ... + 5122532.

Almost surely, 2^20490122 is an apocalyptic number.

20490122 is a deficient number, since it is larger than the sum of its proper divisors (10245064).

20490122 is a wasteful number, since it uses less digits than its factorization.

20490122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10245063.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20490122 is about 4526.6015950158. The cubic root of 20490122 is about 273.6412179418.

Adding to 20490122 its reverse (22109402), we get a palindrome (42599524).

The spelling of 20490122 in words is "twenty million, four hundred ninety thousand, one hundred twenty-two".