20112775 has 6 divisors (see below), whose sum is σ = 24939872. Its totient is φ = 16090200.

The previous prime is 20112767. The next prime is 20112779. The reversal of 20112775 is 57721102.

It is a happy number.

It is not a de Polignac number, because 20112775 - 2³ = 20112767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 804511 = 20112775 / (2 + 0 + 1 + 1 + 2 + 7 + 7 + 5).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402231 + ... + 402280.

Almost surely, 2^20112775 is an apocalyptic number.

20112775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20112775 is a deficient number, since it is larger than the sum of its proper divisors (4827097).

20112775 is an equidigital number, since it uses as much as digits as its factorization.

20112775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804521 (or 804516 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 20112775 is about 4484.7268590183. The cubic root of 20112775 is about 271.9510031050.

Adding to 20112775 its reverse (57721102), we get a palindrome (77833877).

The spelling of 20112775 in words is "twenty million, one hundred twelve thousand, seven hundred seventy-five".