20285345 has 8 divisors (see below), whose sum is σ = 24584040. Its totient is φ = 16067200.

The previous prime is 20285327. The next prime is 20285347. The reversal of 20285345 is 54358202.

It can be written as a sum of positive squares in 4 ways, for example, as 13278736 + 7006609 = 3644^2 + 2647^2 .

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

It is not a de Polignac number, because 20285345 - 2⁶ = 20285281 is a prime.

It is a super-2 number, since 2×20285345² = 822990443538050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20285347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19580 + ... + 20589.

It is an arithmetic number, because the mean of its divisors is an integer number (3073005).

Almost surely, 2^20285345 is an apocalyptic number.

It is an amenable number.

20285345 is a deficient number, since it is larger than the sum of its proper divisors (4298695).

20285345 is a wasteful number, since it uses less digits than its factorization.

20285345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40275.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 20285345 is about 4503.9255100412. The cubic root of 20285345 is about 272.7265797794.

The spelling of 20285345 in words is "twenty million, two hundred eighty-five thousand, three hundred forty-five".