20529161 has 4 divisors (see below), whose sum is σ = 21191424. Its totient is φ = 19866900.

The previous prime is 20529097. The next prime is 20529167. The reversal of 20529161 is 16192502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20529161 - 2⁶ = 20529097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20529161.

It is not an unprimeable number, because it can be changed into a prime (20529167) 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, 331085 + ... + 331146.

It is an arithmetic number, because the mean of its divisors is an integer number (5297856).

Almost surely, 2^20529161 is an apocalyptic number.

It is an amenable number.

20529161 is a deficient number, since it is larger than the sum of its proper divisors (662263).

20529161 is an equidigital number, since it uses as much as digits as its factorization.

20529161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662262.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 20529161 is about 4530.9117184072. The cubic root of 20529161 is about 273.8148935346.

The spelling of 20529161 in words is "twenty million, five hundred twenty-nine thousand, one hundred sixty-one".