20543153 has 4 divisors (see below), whose sum is σ = 20879988. Its totient is φ = 20206320.

The previous prime is 20543143. The next prime is 20543167. The reversal of 20543153 is 35134502.

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 9935104 + 10608049 = 3152^2 + 3257^2 .

It is a cyclic number.

It is not a de Polignac number, because 20543153 - 2⁴ = 20543137 is a prime.

It is a super-2 number, since 2×20543153² = 844042270362818, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20543143) 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, 168326 + ... + 168447.

It is an arithmetic number, because the mean of its divisors is an integer number (5219997).

Almost surely, 2^20543153 is an apocalyptic number.

It is an amenable number.

20543153 is a deficient number, since it is larger than the sum of its proper divisors (336835).

20543153 is an equidigital number, since it uses as much as digits as its factorization.

20543153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336834.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20543153 is about 4532.4555155015. The cubic root of 20543153 is about 273.8770871447.

Adding to 20543153 its reverse (35134502), we get a palindrome (55677655).

The spelling of 20543153 in words is "twenty million, five hundred forty-three thousand, one hundred fifty-three".