20940775 has 6 divisors (see below), whose sum is σ = 25966592. Its totient is φ = 16752600.

The previous prime is 20940763. The next prime is 20940781. The reversal of 20940775 is 57704902.

It is not a de Polignac number, because 20940775 - 2²³ = 12552167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20940775.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 418791 + ... + 418840.

Almost surely, 2^20940775 is an apocalyptic number.

20940775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20940775 is a deficient number, since it is larger than the sum of its proper divisors (5025817).

20940775 is an equidigital number, since it uses as much as digits as its factorization.

20940775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837641 (or 837636 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20940775 is about 4576.1091551666. The cubic root of 20940775 is about 275.6328126669.

The spelling of 20940775 in words is "twenty million, nine hundred forty thousand, seven hundred seventy-five".