20938156 has 12 divisors (see below), whose sum is σ = 37263240. Its totient is φ = 10291520.

The previous prime is 20938117. The next prime is 20938193. The reversal of 20938156 is 65183902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44125 + ... + 44596.

It is an arithmetic number, because the mean of its divisors is an integer number (3105270).

Almost surely, 2^20938156 is an apocalyptic number.

It is an amenable number.

20938156 is a deficient number, since it is larger than the sum of its proper divisors (16325084).

20938156 is a wasteful number, since it uses less digits than its factorization.

20938156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88784 (or 88782 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20938156 is about 4575.8229860868. The cubic root of 20938156 is about 275.6213213311.

The spelling of 20938156 in words is "twenty million, nine hundred thirty-eight thousand, one hundred fifty-six".