20308153 has 4 divisors (see below), whose sum is σ = 20857060. Its totient is φ = 19759248.

The previous prime is 20308129. The next prime is 20308157. The reversal of 20308153 is 35180302.

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 19035769 + 1272384 = 4363^2 + 1128^2 .

It is a cyclic number.

It is not a de Polignac number, because 20308153 - 2⁵ = 20308121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20308157) 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, 274398 + ... + 274471.

It is an arithmetic number, because the mean of its divisors is an integer number (5214265).

Almost surely, 2^20308153 is an apocalyptic number.

It is an amenable number.

20308153 is a deficient number, since it is larger than the sum of its proper divisors (548907).

20308153 is an equidigital number, since it uses as much as digits as its factorization.

20308153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548906.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20308153 is about 4506.4568121752. The cubic root of 20308153 is about 272.8287556439.

Adding to 20308153 its reverse (35180302), we get a palindrome (55488455).

The spelling of 20308153 in words is "twenty million, three hundred eight thousand, one hundred fifty-three".