20495705 has 4 divisors (see below), whose sum is σ = 24594852. Its totient is φ = 16396560.

The previous prime is 20495701. The next prime is 20495719. The reversal of 20495705 is 50759402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50759402 = 2 ⋅25379701.

It can be written as a sum of positive squares in 2 ways, for example, as 6086089 + 14409616 = 2467^2 + 3796^2 .

It is not a de Polignac number, because 20495705 - 2² = 20495701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20495701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2049566 + ... + 2049575.

It is an arithmetic number, because the mean of its divisors is an integer number (6148713).

Almost surely, 2^20495705 is an apocalyptic number.

It is an amenable number.

20495705 is a deficient number, since it is larger than the sum of its proper divisors (4099147).

20495705 is an equidigital number, since it uses as much as digits as its factorization.

20495705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099146.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 20495705 is about 4527.2182408185. The cubic root of 20495705 is about 273.6660689437. Note that the first 3 decimals are identical.

The spelling of 20495705 in words is "twenty million, four hundred ninety-five thousand, seven hundred five".