20843532 has 72 divisors (see below), whose sum is σ = 57308160. Its totient is φ = 6363360.

The previous prime is 20843527. The next prime is 20843549. The reversal of 20843532 is 23534802.

It is a junction number, because it is equal to n+sod(n) for n = 20843496 and 20843505.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20713 + ... + 21695.

Almost surely, 2^20843532 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 20843532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28654080).

20843532 is an abundant number, since it is smaller than the sum of its proper divisors (36464628).

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

20843532 is a wasteful number, since it uses less digits than its factorization.

20843532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20843532 is about 4565.4717171394. The cubic root of 20843532 is about 275.2054970903.

The spelling of 20843532 in words is "twenty million, eight hundred forty-three thousand, five hundred thirty-two".