20733331 has 4 divisors (see below), whose sum is σ = 21239064. Its totient is φ = 20227600.

The previous prime is 20733259. The next prime is 20733337. The reversal of 20733331 is 13333702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20733331 - 2¹¹ = 20731283 is a prime.

It is a super-2 number, since 2×20733331² = 859742028711122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20733337) 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, 252805 + ... + 252886.

It is an arithmetic number, because the mean of its divisors is an integer number (5309766).

Almost surely, 2^20733331 is an apocalyptic number.

20733331 is a deficient number, since it is larger than the sum of its proper divisors (505733).

20733331 is an equidigital number, since it uses as much as digits as its factorization.

20733331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505732.

The product of its (nonzero) digits is 1134, while the sum is 22.

The square root of 20733331 is about 4553.3867615216. The cubic root of 20733331 is about 274.7196305068.

The spelling of 20733331 in words is "twenty million, seven hundred thirty-three thousand, three hundred thirty-one".