20012775 has 12 divisors (see below), whose sum is σ = 33087912. Its totient is φ = 10673440.

The previous prime is 20012771. The next prime is 20012801. The reversal of 20012775 is 57721002.

It is not a de Polignac number, because 20012775 - 2² = 20012771 is a prime.

It is a super-2 number, since 2×20012775² = 801022326401250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133344 + ... + 133493.

It is an arithmetic number, because the mean of its divisors is an integer number (2757326).

Almost surely, 2^20012775 is an apocalyptic number.

20012775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20012775 is a deficient number, since it is larger than the sum of its proper divisors (13075137).

20012775 is a wasteful number, since it uses less digits than its factorization.

20012775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266850 (or 266845 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 20012775 is about 4473.5640154132. The cubic root of 20012775 is about 271.4995438335.

Adding to 20012775 its reverse (57721002), we get a palindrome (77733777).

The spelling of 20012775 in words is "twenty million, twelve thousand, seven hundred seventy-five".