20726705 has 4 divisors (see below), whose sum is σ = 24872052. Its totient is φ = 16581360.

The previous prime is 20726683. The next prime is 20726711. The reversal of 20726705 is 50762702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13366336 + 7360369 = 3656^2 + 2713^2 .

It is not a de Polignac number, because 20726705 - 2²² = 16532401 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2072666 + ... + 2072675.

It is an arithmetic number, because the mean of its divisors is an integer number (6218013).

Almost surely, 2^20726705 is an apocalyptic number.

It is an amenable number.

20726705 is a deficient number, since it is larger than the sum of its proper divisors (4145347).

20726705 is an equidigital number, since it uses as much as digits as its factorization.

20726705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145346.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20726705 is about 4552.6591130898. The cubic root of 20726705 is about 274.6903622363.

The spelling of 20726705 in words is "twenty million, seven hundred twenty-six thousand, seven hundred five".