20520163 has 8 divisors (see below), whose sum is σ = 21991968. Its totient is φ = 19096704.

The previous prime is 20520161. The next prime is 20520167. The reversal of 20520163 is 36102502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20520163 - 2¹ = 20520161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20520163.

It is not an unprimeable number, because it can be changed into a prime (20520161) 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 7 ways as a sum of consecutive naturals, for example, 11206 + ... + 12907.

It is an arithmetic number, because the mean of its divisors is an integer number (2748996).

Almost surely, 2^20520163 is an apocalyptic number.

20520163 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20520163 is a deficient number, since it is larger than the sum of its proper divisors (1471805).

20520163 is a wasteful number, since it uses less digits than its factorization.

20520163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24173.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20520163 is about 4529.9186526912. The cubic root of 20520163 is about 273.7748830269.

Adding to 20520163 its reverse (36102502), we get a palindrome (56622665).

The spelling of 20520163 in words is "twenty million, five hundred twenty thousand, one hundred sixty-three".