20209938 has 32 divisors (see below), whose sum is σ = 46786560. Its totient is φ = 5700240.

The previous prime is 20209933. The next prime is 20209949. The reversal of 20209938 is 83990202.

It is a junction number, because it is equal to n+sod(n) for n = 20209899 and 20209908.

It is not an unprimeable number, because it can be changed into a prime (20209933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (1462080).

Almost surely, 2^20209938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20209938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23393280).

20209938 is an abundant number, since it is smaller than the sum of its proper divisors (26576622).

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

20209938 is a wasteful number, since it uses less digits than its factorization.

20209938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6182.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20209938 is about 4495.5464628897. The cubic root of 20209938 is about 272.3882233821.

The spelling of 20209938 in words is "twenty million, two hundred nine thousand, nine hundred thirty-eight".