20019872 has 12 divisors (see below), whose sum is σ = 39414186. Its totient is φ = 10009920.

The previous prime is 20019869. The next prime is 20019887. The reversal of 20019872 is 27891002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10995856 + 9024016 = 3316^2 + 3004^2 .

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, 312779 + ... + 312842.

Almost surely, 2^20019872 is an apocalyptic number.

It is an amenable number.

20019872 is a deficient number, since it is larger than the sum of its proper divisors (19394314).

20019872 is an equidigital number, since it uses as much as digits as its factorization.

20019872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625631 (or 625623 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20019872 is about 4474.3571605316. The cubic root of 20019872 is about 271.5316334120.

The spelling of 20019872 in words is "twenty million, nineteen thousand, eight hundred seventy-two".