20529218 has 8 divisors (see below), whose sum is σ = 30972348. Its totient is φ = 10205104.

The previous prime is 20529211. The next prime is 20529221. The reversal of 20529218 is 81292502.

It can be written as a sum of positive squares in 2 ways, for example, as 19562929 + 966289 = 4423^2 + 983^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20529211) 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, 29321 + ... + 30012.

Almost surely, 2^20529218 is an apocalyptic number.

20529218 is a deficient number, since it is larger than the sum of its proper divisors (10443130).

20529218 is a wasteful number, since it uses less digits than its factorization.

20529218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59508.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20529218 is about 4530.9180085276. The cubic root of 20529218 is about 273.8151469535.

The spelling of 20529218 in words is "twenty million, five hundred twenty-nine thousand, two hundred eighteen".