20720033 has 8 divisors (see below), whose sum is σ = 21988800. Its totient is φ = 19481968.

The previous prime is 20720027. The next prime is 20720039. The reversal of 20720033 is 33002702.

It is an interprime number because it is at equal distance from previous prime (20720027) and next prime (20720039).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20720033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20719993 and 20720020.

It is not an unprimeable number, because it can be changed into a prime (20720039) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 6278 + ... + 8991.

It is an arithmetic number, because the mean of its divisors is an integer number (2748600).

Almost surely, 2^20720033 is an apocalyptic number.

20720033 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20720033 is a deficient number, since it is larger than the sum of its proper divisors (1268767).

20720033 is a wasteful number, since it uses less digits than its factorization.

20720033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15351.

The product of its (nonzero) digits is 252, while the sum is 17.

The square root of 20720033 is about 4551.9262955369. The cubic root of 20720033 is about 274.6608844718.

Adding to 20720033 its reverse (33002702), we get a palindrome (53722735).

The spelling of 20720033 in words is "twenty million, seven hundred twenty thousand, thirty-three".