20994133 has 8 divisors (see below), whose sum is σ = 22830552. Its totient is φ = 19224576.

The previous prime is 20994131. The next prime is 20994137. The reversal of 20994133 is 33149902.

It can be written as a sum of positive squares in 4 ways, for example, as 12659364 + 8334769 = 3558^2 + 2887^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20994133 - 2¹ = 20994131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20994095 and 20994104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20994131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16060 + ... + 17317.

It is an arithmetic number, because the mean of its divisors is an integer number (2853819).

Almost surely, 2^20994133 is an apocalyptic number.

It is an amenable number.

20994133 is a deficient number, since it is larger than the sum of its proper divisors (1836419).

20994133 is a wasteful number, since it uses less digits than its factorization.

20994133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33431.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20994133 is about 4581.9355080577. The cubic root of 20994133 is about 275.8667222162.

The spelling of 20994133 in words is "twenty million, nine hundred ninety-four thousand, one hundred thirty-three".