20211933 has 16 divisors (see below), whose sum is σ = 30865536. Its totient is φ = 11524800.

The previous prime is 20211931. The next prime is 20211937. The reversal of 20211933 is 33911202.

It is a happy number.

It is not a de Polignac number, because 20211933 - 2¹ = 20211931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211931) 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 15 ways as a sum of consecutive naturals, for example, 14035 + ... + 15407.

It is an arithmetic number, because the mean of its divisors is an integer number (1929096).

Almost surely, 2^20211933 is an apocalyptic number.

It is an amenable number.

20211933 is a deficient number, since it is larger than the sum of its proper divisors (10653603).

20211933 is a wasteful number, since it uses less digits than its factorization.

20211933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20211933 is about 4495.7683436761. The cubic root of 20211933 is about 272.3971859137.

The spelling of 20211933 in words is "twenty million, two hundred eleven thousand, nine hundred thirty-three".