20985938 has 16 divisors (see below), whose sum is σ = 31971456. Its totient is φ = 10330320.

The previous prime is 20985911. The next prime is 20985953. The reversal of 20985938 is 83958902.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45095 + ... + 45557.

It is an arithmetic number, because the mean of its divisors is an integer number (1998216).

Almost surely, 2^20985938 is an apocalyptic number.

20985938 is a deficient number, since it is larger than the sum of its proper divisors (10985518).

20985938 is a wasteful number, since it uses less digits than its factorization.

20985938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 20985938 is about 4581.0411480361. The cubic root of 20985938 is about 275.8308229484.

The spelling of 20985938 in words is "twenty million, nine hundred eighty-five thousand, nine hundred thirty-eight".