20285207 has 4 divisors (see below), whose sum is σ = 20757000. Its totient is φ = 19813416.

The previous prime is 20285099. The next prime is 20285263. The reversal of 20285207 is 70258202.

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

It is a cyclic number.

It is not a de Polignac number, because 20285207 - 2¹⁶ = 20219671 is a prime.

It is a super-2 number, since 2×20285207² = 822979246065698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287207) 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 3 ways as a sum of consecutive naturals, for example, 235832 + ... + 235917.

It is an arithmetic number, because the mean of its divisors is an integer number (5189250).

Almost surely, 2^20285207 is an apocalyptic number.

20285207 is a deficient number, since it is larger than the sum of its proper divisors (471793).

20285207 is an equidigital number, since it uses as much as digits as its factorization.

20285207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471792.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 20285207 is about 4503.9101900460. The cubic root of 20285207 is about 272.7259613304.

The spelling of 20285207 in words is "twenty million, two hundred eighty-five thousand, two hundred seven".