20490579 has 12 divisors (see below), whose sum is σ = 29644056. Its totient is φ = 13638912.

The previous prime is 20490557. The next prime is 20490599. The reversal of 20490579 is 97509402.

It is not a de Polignac number, because 20490579 - 2⁷ = 20490451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20490599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6067 + ... + 8819.

It is an arithmetic number, because the mean of its divisors is an integer number (2470338).

Almost surely, 2^20490579 is an apocalyptic number.

20490579 is a deficient number, since it is larger than the sum of its proper divisors (9153477).

20490579 is a wasteful number, since it uses less digits than its factorization.

20490579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3586 (or 3583 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20490579 is about 4526.6520741051. The cubic root of 20490579 is about 273.6432523059.

The spelling of 20490579 in words is "twenty million, four hundred ninety thousand, five hundred seventy-nine".