20490530 has 16 divisors (see below), whose sum is σ = 38155320. Its totient is φ = 7913472.

The previous prime is 20490527. The next prime is 20490551. The reversal of 20490530 is 3509402.

It can be written as a sum of positive squares in 4 ways, for example, as 19864849 + 625681 = 4457^2 + 791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20490496 and 20490505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35039 + ... + 35618.

Almost surely, 2^20490530 is an apocalyptic number.

20490530 is a deficient number, since it is larger than the sum of its proper divisors (17664790).

20490530 is a wasteful number, since it uses less digits than its factorization.

20490530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70693.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20490530 is about 4526.6466617133. The cubic root of 20490530 is about 273.6430341808.

Adding to 20490530 its reverse (3509402), we get a palindrome (23999932).

The spelling of 20490530 in words is "twenty million, four hundred ninety thousand, five hundred thirty".