20490574 has 12 divisors (see below), whose sum is σ = 33282576. Its totient is φ = 9457032.

The previous prime is 20490557. The next prime is 20490599. The reversal of 20490574 is 47509402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29974 + ... + 30649.

It is an arithmetic number, because the mean of its divisors is an integer number (2773548).

Almost surely, 2^20490574 is an apocalyptic number.

20490574 is a deficient number, since it is larger than the sum of its proper divisors (12792002).

20490574 is a wasteful number, since it uses less digits than its factorization.

20490574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60651 (or 60638 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20490574 is about 4526.6515218205. The cubic root of 20490574 is about 273.6432300482.

Adding to 20490574 its reverse (47509402), we get a palindrome (67999976).

The spelling of 20490574 in words is "twenty million, four hundred ninety thousand, five hundred seventy-four".