20671938 has 48 divisors (see below), whose sum is σ = 51442560. Its totient is φ = 5876928.

The previous prime is 20671933. The next prime is 20671939. The reversal of 20671938 is 83917602.

It is not an unprimeable number, because it can be changed into a prime (20671933) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45006 + ... + 45462.

It is an arithmetic number, because the mean of its divisors is an integer number (1071720).

Almost surely, 2^20671938 is an apocalyptic number.

20671938 is an abundant number, since it is smaller than the sum of its proper divisors (30770622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20671938 is a wasteful number, since it uses less digits than its factorization.

20671938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 20671938 is about 4546.6402980663. The cubic root of 20671938 is about 274.4482070557.

It can be divided in two parts, 20671 and 938, that added together give a square (21609 = 147²).

The spelling of 20671938 in words is "twenty million, six hundred seventy-one thousand, nine hundred thirty-eight".