20019812 has 48 divisors (see below), whose sum is σ = 38974320. Its totient is φ = 8957952.

The previous prime is 20019781. The next prime is 20019817. The reversal of 20019812 is 21891002.

It can be written as a sum of positive squares in 8 ways, for example, as 4778596 + 15241216 = 2186^2 + 3904^2 .

It is not an unprimeable number, because it can be changed into a prime (20019817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183614 + ... + 183722.

It is an arithmetic number, because the mean of its divisors is an integer number (811965).

Almost surely, 2^20019812 is an apocalyptic number.

It is an amenable number.

20019812 is a deficient number, since it is larger than the sum of its proper divisors (18954508).

20019812 is a wasteful number, since it uses less digits than its factorization.

20019812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20019812 is about 4474.3504556528. The cubic root of 20019812 is about 271.5313621496.

The spelling of 20019812 in words is "twenty million, nineteen thousand, eight hundred twelve".