20285506 has 4 divisors (see below), whose sum is σ = 30428262. Its totient is φ = 10142752.

The previous prime is 20285497. The next prime is 20285519. The reversal of 20285506 is 60558202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 349281 = 4465^2 + 591^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5071375 + ... + 5071378.

Almost surely, 2^20285506 is an apocalyptic number.

20285506 is a deficient number, since it is larger than the sum of its proper divisors (10142756).

20285506 is a wasteful number, since it uses less digits than its factorization.

20285506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10142755.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 20285506 is about 4503.9433833031. The cubic root of 20285506 is about 272.7273012997.

The spelling of 20285506 in words is "twenty million, two hundred eighty-five thousand, five hundred six".