20155633 has 4 divisors (see below), whose sum is σ = 20215780. Its totient is φ = 20095488.

The previous prime is 20155627. The next prime is 20155643. The reversal of 20155633 is 33655102.

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 11675889 + 8479744 = 3417^2 + 2912^2 .

It is a cyclic number.

It is not a de Polignac number, because 20155633 - 2⁵ = 20155601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20155598 and 20155607.

It is not an unprimeable number, because it can be changed into a prime (20155643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29568 + ... + 30241.

It is an arithmetic number, because the mean of its divisors is an integer number (5053945).

Almost surely, 2^20155633 is an apocalyptic number.

It is an amenable number.

20155633 is a deficient number, since it is larger than the sum of its proper divisors (60147).

20155633 is an equidigital number, since it uses as much as digits as its factorization.

20155633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60146.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 20155633 is about 4489.5025336890. The cubic root of 20155633 is about 272.1440314529.

The spelling of 20155633 in words is "twenty million, one hundred fifty-five thousand, six hundred thirty-three".