20849312 has 48 divisors (see below), whose sum is σ = 45559584. Its totient is φ = 9312000.

The previous prime is 20849273. The next prime is 20849317. The reversal of 20849312 is 21394802.

It is not an unprimeable number, because it can be changed into a prime (20849317) 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, 20987 + ... + 21957.

It is an arithmetic number, because the mean of its divisors is an integer number (949158).

Almost surely, 2^20849312 is an apocalyptic number.

20849312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20849312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22779792).

20849312 is an abundant number, since it is smaller than the sum of its proper divisors (24710272).

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

20849312 is a wasteful number, since it uses less digits than its factorization.

20849312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053 (or 1045 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20849312 is about 4566.1046856155. The cubic root of 20849312 is about 275.2309332905.

Subtracting 20849312 from its reverse (21394802), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 20849312 in words is "twenty million, eight hundred forty-nine thousand, three hundred twelve".