20901938 has 16 divisors (see below), whose sum is σ = 33095520. Its totient is φ = 9873216.

The previous prime is 20901931. The next prime is 20901941. The reversal of 20901938 is 83910902.

It is not an unprimeable number, because it can be changed into a prime (20901931) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20906 + ... + 21882.

It is an arithmetic number, because the mean of its divisors is an integer number (2068470).

Almost surely, 2^20901938 is an apocalyptic number.

20901938 is a deficient number, since it is larger than the sum of its proper divisors (12193582).

20901938 is a wasteful number, since it uses less digits than its factorization.

20901938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20901938 is about 4571.8637337524. The cubic root of 20901938 is about 275.4623099659.

The spelling of 20901938 in words is "twenty million, nine hundred one thousand, nine hundred thirty-eight".