20775775 has 6 divisors (see below), whose sum is σ = 25761992. Its totient is φ = 16620600.

The previous prime is 20775767. The next prime is 20775779. The reversal of 20775775 is 57757702.

It is not a de Polignac number, because 20775775 - 2³ = 20775767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 415491 + ... + 415540.

Almost surely, 2^20775775 is an apocalyptic number.

20775775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20775775 is a deficient number, since it is larger than the sum of its proper divisors (4986217).

20775775 is an equidigital number, since it uses as much as digits as its factorization.

20775775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831041 (or 831036 counting only the distinct ones).

The product of its (nonzero) digits is 120050, while the sum is 40.

The square root of 20775775 is about 4558.0450853409. The cubic root of 20775775 is about 274.9069657747.

The spelling of 20775775 in words is "twenty million, seven hundred seventy-five thousand, seven hundred seventy-five".