20832840 has 144 divisors (see below), whose sum is σ = 78827580. Its totient is φ = 4757760.

The previous prime is 20832821. The next prime is 20832859. The reversal of 20832840 is 4823802.

It is an interprime number because it is at equal distance from previous prime (20832821) and next prime (20832859).

It can be written as a sum of positive squares in 2 ways, for example, as 20196036 + 636804 = 4494^2 + 798^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17050 + ... + 18230.

Almost surely, 2^20832840 is an apocalyptic number.

20832840 is a gapful number since it is divisible by the number (20) 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 20832840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39413790).

20832840 is an abundant number, since it is smaller than the sum of its proper divisors (57994740).

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

20832840 is a wasteful number, since it uses less digits than its factorization.

20832840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212 (or 1198 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20832840 is about 4564.3006035974. The cubic root of 20832840 is about 275.1584321230.

The spelling of 20832840 in words is "twenty million, eight hundred thirty-two thousand, eight hundred forty".