20490452 has 12 divisors (see below), whose sum is σ = 36827700. Its totient is φ = 9968256.

The previous prime is 20490451. The next prime is 20490461. The reversal of 20490452 is 25409402.

It can be written as a sum of positive squares in 2 ways, for example, as 18541636 + 1948816 = 4306^2 + 1396^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20490451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69077 + ... + 69372.

It is an arithmetic number, because the mean of its divisors is an integer number (3068975).

Almost surely, 2^20490452 is an apocalyptic number.

It is an amenable number.

20490452 is a deficient number, since it is larger than the sum of its proper divisors (16337248).

20490452 is a wasteful number, since it uses less digits than its factorization.

20490452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138490 (or 138488 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20490452 is about 4526.6380460558. The cubic root of 20490452 is about 273.6426869605.

Adding to 20490452 its reverse (25409402), we get a palindrome (45899854).

The spelling of 20490452 in words is "twenty million, four hundred ninety thousand, four hundred fifty-two".