20285713 has 4 divisors (see below), whose sum is σ = 23183680. Its totient is φ = 17387748.

The previous prime is 20285677. The next prime is 20285719. The reversal of 20285713 is 31758202.

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 de Polignac number, because none of the positive numbers 2^k-20285713 is a prime.

It is a super-3 number, since 3×20285713³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20285719) 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, 1448973 + ... + 1448986.

It is an arithmetic number, because the mean of its divisors is an integer number (5795920).

Almost surely, 2^20285713 is an apocalyptic number.

It is an amenable number.

20285713 is a deficient number, since it is larger than the sum of its proper divisors (2897967).

20285713 is an equidigital number, since it uses as much as digits as its factorization.

20285713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897966.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20285713 is about 4503.9663631071. The cubic root of 20285713 is about 272.7282289630.

The spelling of 20285713 in words is "twenty million, two hundred eighty-five thousand, seven hundred thirteen".