20805795 has 32 divisors (see below), whose sum is σ = 37204800. Its totient is φ = 11031552.

The previous prime is 20805791. The next prime is 20805853. The reversal of 20805795 is 59750802.

20805795 is a `hidden beast` number, since 2 + 0 + 80 + 579 + 5 = 666.

It is not a de Polignac number, because 20805795 - 2² = 20805791 is a prime.

It is a super-2 number, since 2×20805795² = 865762211164050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20805791) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30579 + ... + 31251.

It is an arithmetic number, because the mean of its divisors is an integer number (1162650).

Almost surely, 2^20805795 is an apocalyptic number.

20805795 is a deficient number, since it is larger than the sum of its proper divisors (16399005).

20805795 is a wasteful number, since it uses less digits than its factorization.

20805795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 20805795 is about 4561.3369750546. The cubic root of 20805795 is about 275.0393111846.

It can be divided in two parts, 2080 and 5795, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 20805795 in words is "twenty million, eight hundred five thousand, seven hundred ninety-five".