20726633 has 4 divisors (see below), whose sum is σ = 20748420. Its totient is φ = 20704848.

The previous prime is 20726627. The next prime is 20726647. The reversal of 20726633 is 33662702.

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 18079504 + 2647129 = 4252^2 + 1627^2 .

It is a cyclic number.

It is not a de Polignac number, because 20726633 - 2⁴ = 20726617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20726596 and 20726605.

It is not an unprimeable number, because it can be changed into a prime (20726653) 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, 9398 + ... + 11391.

It is an arithmetic number, because the mean of its divisors is an integer number (5187105).

Almost surely, 2^20726633 is an apocalyptic number.

It is an amenable number.

20726633 is a deficient number, since it is larger than the sum of its proper divisors (21787).

20726633 is an equidigital number, since it uses as much as digits as its factorization.

20726633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21786.

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 20726633 is about 4552.6512056163. The cubic root of 20726633 is about 274.6900441647.

The spelling of 20726633 in words is "twenty million, seven hundred twenty-six thousand, six hundred thirty-three".