20211944 has 8 divisors (see below), whose sum is σ = 37897410. Its totient is φ = 10105968.

The previous prime is 20211943. The next prime is 20211949. The reversal of 20211944 is 44911202.

It can be written as a sum of positive squares in only one way, i.e., 19909444 + 302500 = 4462^2 + 550^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20211943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1263239 + ... + 1263254.

Almost surely, 2^20211944 is an apocalyptic number.

It is an amenable number.

20211944 is a deficient number, since it is larger than the sum of its proper divisors (17685466).

20211944 is a wasteful number, since it uses less digits than its factorization.

20211944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526499 (or 2526495 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20211944 is about 4495.7695670486. The cubic root of 20211944 is about 272.3972353295.

The spelling of 20211944 in words is "twenty million, two hundred eleven thousand, nine hundred forty-four".