20001964 has 6 divisors (see below), whose sum is σ = 35003444. Its totient is φ = 10000980.

The previous prime is 20001959. The next prime is 20001977. The reversal of 20001964 is 46910002.

It is an unprimeable number.

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, 2500242 + ... + 2500249.

Almost surely, 2^20001964 is an apocalyptic number.

It is an amenable number.

20001964 is a deficient number, since it is larger than the sum of its proper divisors (15001480).

20001964 is a wasteful number, since it uses less digits than its factorization.

20001964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000495 (or 5000493 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20001964 is about 4472.3555314845. The cubic root of 20001964 is about 271.4506465623.

Adding to 20001964 its reverse (46910002), we get a palindrome (66911966).

The spelling of 20001964 in words is "twenty million, one thousand, nine hundred sixty-four".