20211939 has 12 divisors (see below), whose sum is σ = 31849272. Its totient is φ = 12249600.

The previous prime is 20211937. The next prime is 20211943. The reversal of 20211939 is 93911202.

It is not a de Polignac number, because 20211939 - 2¹ = 20211937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20211931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101982 + ... + 102179.

It is an arithmetic number, because the mean of its divisors is an integer number (2654106).

Almost surely, 2^20211939 is an apocalyptic number.

20211939 is a deficient number, since it is larger than the sum of its proper divisors (11637333).

20211939 is a wasteful number, since it uses less digits than its factorization.

20211939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204178 (or 204175 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 20211939 is about 4495.7690109702. The cubic root of 20211939 is about 272.3972128678.

It can be divided in two parts, 2021193 and 9, that added together give a palindrome (2021202).

The spelling of 20211939 in words is "twenty million, two hundred eleven thousand, nine hundred thirty-nine".