20852685 has 60 divisors (see below), whose sum is σ = 42384732. Its totient is φ = 9483264.

The previous prime is 20852639. The next prime is 20852687. The reversal of 20852685 is 58625802.

It can be written as a sum of positive squares in 2 ways, for example, as 6245001 + 14607684 = 2499^2 + 3822^2 .

It is not a de Polignac number, because 20852685 - 2⁶ = 20852621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20852687) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 107949 + ... + 108141.

Almost surely, 2^20852685 is an apocalyptic number.

It is an amenable number.

20852685 is an abundant number, since it is smaller than the sum of its proper divisors (21532047).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20852685 is an equidigital number, since it uses as much as digits as its factorization.

20852685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 20852685 is about 4566.4740227007. The cubic root of 20852685 is about 275.2457747695.

The spelling of 20852685 in words is "twenty million, eight hundred fifty-two thousand, six hundred eighty-five".