20291232 has 96 divisors (see below), whose sum is σ = 58423680. Its totient is φ = 6128640.

The previous prime is 20291231. The next prime is 20291233. The reversal of 20291232 is 23219202.

It is an interprime number because it is at equal distance from previous prime (20291231) and next prime (20291233).

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 20291199 and 20291208.

It is not an unprimeable number, because it can be changed into a prime (20291231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88494 + ... + 88722.

It is an arithmetic number, because the mean of its divisors is an integer number (608580).

Almost surely, 2^20291232 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 20291232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29211840).

20291232 is an abundant number, since it is smaller than the sum of its proper divisors (38132448).

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

20291232 is a wasteful number, since it uses less digits than its factorization.

20291232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20291232 is about 4504.5790036362. The cubic root of 20291232 is about 272.7529598432.

The spelling of 20291232 in words is "twenty million, two hundred ninety-one thousand, two hundred thirty-two".