20351836 has 6 divisors (see below), whose sum is σ = 35615720. Its totient is φ = 10175916.

The previous prime is 20351827. The next prime is 20351843. The reversal of 20351836 is 63815302.

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 as a sum of consecutive naturals, namely, 2543976 + ... + 2543983.

Almost surely, 2^20351836 is an apocalyptic number.

It is an amenable number.

20351836 is a deficient number, since it is larger than the sum of its proper divisors (15263884).

20351836 is a wasteful number, since it uses less digits than its factorization.

20351836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5087963 (or 5087961 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20351836 is about 4511.3009210205. The cubic root of 20351836 is about 273.0242344992.

The spelling of 20351836 in words is "twenty million, three hundred fifty-one thousand, eight hundred thirty-six".