20497992 has 16 divisors (see below), whose sum is σ = 51245040. Its totient is φ = 6832656.

The previous prime is 20497921. The next prime is 20497993. The reversal of 20497992 is 29979402.

It is not an unprimeable number, because it can be changed into a prime (20497993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427018 + ... + 427065.

It is an arithmetic number, because the mean of its divisors is an integer number (3202815).

Almost surely, 2^20497992 is an apocalyptic number.

It is an amenable number.

20497992 is an abundant number, since it is smaller than the sum of its proper divisors (30747048).

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

20497992 is a wasteful number, since it uses less digits than its factorization.

20497992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854092 (or 854088 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 20497992 is about 4527.4708171340. The cubic root of 20497992 is about 273.6762475156.

The spelling of 20497992 in words is "twenty million, four hundred ninety-seven thousand, nine hundred ninety-two".