20245385 has 8 divisors (see below), whose sum is σ = 25723656. Its totient is φ = 15243520.

The previous prime is 20245369. The next prime is 20245399. The reversal of 20245385 is 58354202.

It can be written as a sum of positive squares in 4 ways, for example, as 5721664 + 14523721 = 2392^2 + 3811^2 .

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

It is not a de Polignac number, because 20245385 - 2⁴ = 20245369 is a prime.

It is a super-2 number, since 2×20245385² = 819751227596450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 119006 + ... + 119175.

It is an arithmetic number, because the mean of its divisors is an integer number (3215457).

Almost surely, 2^20245385 is an apocalyptic number.

It is an amenable number.

20245385 is a deficient number, since it is larger than the sum of its proper divisors (5478271).

20245385 is a wasteful number, since it uses less digits than its factorization.

20245385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238203.

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

The square root of 20245385 is about 4499.4871930032. The cubic root of 20245385 is about 272.5473811503.

Adding to 20245385 its reverse (58354202), we get a palindrome (78599587).

The spelling of 20245385 in words is "twenty million, two hundred forty-five thousand, three hundred eighty-five".