20805675 has 24 divisors (see below), whose sum is σ = 37527360. Its totient is φ = 10087200.

The previous prime is 20805647. The next prime is 20805689. The reversal of 20805675 is 57650802.

It is a happy number.

It is not a de Polignac number, because 20805675 - 2⁵ = 20805643 is a prime.

It is a super-2 number, since 2×20805675² = 865752224411250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11785 + ... + 13434.

It is an arithmetic number, because the mean of its divisors is an integer number (1563640).

Almost surely, 2^20805675 is an apocalyptic number.

20805675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20805675 is a deficient number, since it is larger than the sum of its proper divisors (16721685).

20805675 is a wasteful number, since it uses less digits than its factorization.

20805675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25243 (or 25238 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 20805675 is about 4561.3238209976. The cubic root of 20805675 is about 275.0387824092.

The spelling of 20805675 in words is "twenty million, eight hundred five thousand, six hundred seventy-five".