20387996 has 6 divisors (see below), whose sum is σ = 35679000. Its totient is φ = 10193996.

The previous prime is 20387993. The next prime is 20388013. The reversal of 20387996 is 69978302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20387993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2548496 + ... + 2548503.

It is an arithmetic number, because the mean of its divisors is an integer number (5946500).

Almost surely, 2^20387996 is an apocalyptic number.

It is an amenable number.

20387996 is a deficient number, since it is larger than the sum of its proper divisors (15291004).

20387996 is a wasteful number, since it uses less digits than its factorization.

20387996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5097003 (or 5097001 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 20387996 is about 4515.3068555747. The cubic root of 20387996 is about 273.1858368739.

The spelling of 20387996 in words is "twenty million, three hundred eighty-seven thousand, nine hundred ninety-six".