20529805 has 8 divisors (see below), whose sum is σ = 25003872. Its totient is φ = 16178448.

The previous prime is 20529799. The next prime is 20529851. The reversal of 20529805 is 50892502.

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 20529805 - 2¹⁷ = 20398733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30307 + ... + 30976.

It is an arithmetic number, because the mean of its divisors is an integer number (3125484).

Almost surely, 2^20529805 is an apocalyptic number.

It is an amenable number.

20529805 is a deficient number, since it is larger than the sum of its proper divisors (4474067).

20529805 is an equidigital number, since it uses as much as digits as its factorization.

20529805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61355.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 20529805 is about 4530.9827852244. The cubic root of 20529805 is about 273.8177566967.

The spelling of 20529805 in words is "twenty million, five hundred twenty-nine thousand, eight hundred five".