20733975 has 36 divisors (see below), whose sum is σ = 38523576. Its totient is φ = 11054880.

The previous prime is 20733943. The next prime is 20734001. The reversal of 20733975 is 57933702.

It is a happy number.

It is not a de Polignac number, because 20733975 - 2⁵ = 20733943 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 4369 + ... + 7781.

Almost surely, 2^20733975 is an apocalyptic number.

20733975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20733975 is a deficient number, since it is larger than the sum of its proper divisors (17789601).

20733975 is an equidigital number, since it uses as much as digits as its factorization.

20733975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3438 (or 3421 counting only the distinct ones).

The product of its (nonzero) digits is 39690, while the sum is 36.

The square root of 20733975 is about 4553.4574775658. The cubic root of 20733975 is about 274.7224748416.

The spelling of 20733975 in words is "twenty million, seven hundred thirty-three thousand, nine hundred seventy-five".