20745475 has 6 divisors (see below), whose sum is σ = 25724420. Its totient is φ = 16596360.

The previous prime is 20745451. The next prime is 20745497. The reversal of 20745475 is 57454702.

It is not a de Polignac number, because 20745475 - 2⁵ = 20745443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20745475.

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 5 ways as a sum of consecutive naturals, for example, 414885 + ... + 414934.

Almost surely, 2^20745475 is an apocalyptic number.

20745475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20745475 is a deficient number, since it is larger than the sum of its proper divisors (4978945).

20745475 is an equidigital number, since it uses as much as digits as its factorization.

20745475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829829 (or 829824 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 34.

The square root of 20745475 is about 4554.7200792145. The cubic root of 20745475 is about 274.7732566228.

The spelling of 20745475 in words is "twenty million, seven hundred forty-five thousand, four hundred seventy-five".