20031994 has 8 divisors (see below), whose sum is σ = 30214548. Its totient is φ = 9960480.

The previous prime is 20031989. The next prime is 20031997. The reversal of 20031994 is 49913002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16916769 + 3115225 = 4113^2 + 1765^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20031997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27307 + ... + 28030.

Almost surely, 2^20031994 is an apocalyptic number.

20031994 is a deficient number, since it is larger than the sum of its proper divisors (10182554).

20031994 is a wasteful number, since it uses less digits than its factorization.

20031994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55520.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20031994 is about 4475.7115635394. The cubic root of 20031994 is about 271.5864263422.

Adding to 20031994 its reverse (49913002), we get a palindrome (69944996).

It can be divided in two parts, 20031 and 994, that added together give a square (21025 = 145²).

The spelling of 20031994 in words is "twenty million, thirty-one thousand, nine hundred ninety-four".