20975750 has 16 divisors (see below), whose sum is σ = 39267072. Its totient is φ = 8390200.

The previous prime is 20975749. The next prime is 20975789. The reversal of 20975750 is 5757902.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20975750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41702 + ... + 42201.

It is an arithmetic number, because the mean of its divisors is an integer number (2454192).

Almost surely, 2^20975750 is an apocalyptic number.

20975750 is a deficient number, since it is larger than the sum of its proper divisors (18291322).

20975750 is an equidigital number, since it uses as much as digits as its factorization.

20975750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83920 (or 83910 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 35.

The square root of 20975750 is about 4579.9290387516. The cubic root of 20975750 is about 275.7861800500.

The spelling of 20975750 in words is "twenty million, nine hundred seventy-five thousand, seven hundred fifty".