20497904 has 40 divisors (see below), whose sum is σ = 45601248. Its totient is φ = 8743680.

The previous prime is 20497901. The next prime is 20497921. The reversal of 20497904 is 40979402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44234 + ... + 44694.

Almost surely, 2^20497904 is an apocalyptic number.

It is an amenable number.

20497904 is an abundant number, since it is smaller than the sum of its proper divisors (25103344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20497904 is a wasteful number, since it uses less digits than its factorization.

20497904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20497904 is about 4527.4610986733. The cubic root of 20497904 is about 273.6758558749.

The spelling of 20497904 in words is "twenty million, four hundred ninety-seven thousand, nine hundred four".