20849268 has 72 divisors (see below), whose sum is σ = 54429984. Its totient is φ = 6205760.

The previous prime is 20849263. The next prime is 20849273. The reversal of 20849268 is 86294802.

It is an interprime number because it is at equal distance from previous prime (20849263) and next prime (20849273).

It is a super-2 number, since 2×20849268² = 869383952271648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120430 + ... + 120602.

It is an arithmetic number, because the mean of its divisors is an integer number (755972).

Almost surely, 2^20849268 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20849268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27214992).

20849268 is an abundant number, since it is smaller than the sum of its proper divisors (33580716).

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

20849268 is a wasteful number, since it uses less digits than its factorization.

20849268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 20849268 is about 4566.0998675018. The cubic root of 20849268 is about 275.2307396763.

The spelling of 20849268 in words is "twenty million, eight hundred forty-nine thousand, two hundred sixty-eight".