20403992 has 24 divisors (see below), whose sum is σ = 44504460. Its totient is φ = 8744400.

The previous prime is 20403989. The next prime is 20404009. The reversal of 20403992 is 29930402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25634 + ... + 26417.

Almost surely, 2^20403992 is an apocalyptic number.

It is an amenable number.

20403992 is an abundant number, since it is smaller than the sum of its proper divisors (24100468).

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

20403992 is a wasteful number, since it uses less digits than its factorization.

20403992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52071 (or 52060 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20403992 is about 4517.0778164650. The cubic root of 20403992 is about 273.2572635165.

The spelling of 20403992 in words is "twenty million, four hundred three thousand, nine hundred ninety-two".