20001872 has 20 divisors (see below), whose sum is σ = 42277056. Its totient is φ = 9091680.

The previous prime is 20001853. The next prime is 20001899. The reversal of 20001872 is 27810002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56648 + ... + 56999.

Almost surely, 2^20001872 is an apocalyptic number.

20001872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20001872 is an abundant number, since it is smaller than the sum of its proper divisors (22275184).

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

20001872 is a wasteful number, since it uses less digits than its factorization.

20001872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113666 (or 113660 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 20001872 is about 4472.3452460650. The cubic root of 20001872 is about 271.4502303782.

Adding to 20001872 its reverse (27810002), we get a palindrome (47811874).

The spelling of 20001872 in words is "twenty million, one thousand, eight hundred seventy-two".