20423232 has 112 divisors (see below), whose sum is σ = 61447680. Its totient is φ = 6649344.

The previous prime is 20423231. The next prime is 20423257. The reversal of 20423232 is 23232402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423231) 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, 91473 + ... + 91695.

It is an arithmetic number, because the mean of its divisors is an integer number (548640).

Almost surely, 2^20423232 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 20423232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30723840).

20423232 is an abundant number, since it is smaller than the sum of its proper divisors (41024448).

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

20423232 is a wasteful number, since it uses less digits than its factorization.

20423232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 20423232 is about 4519.2070100848. The cubic root of 20423232 is about 273.3431260950.

Adding to 20423232 its reverse (23232402), we get a palindrome (43655634).

It can be divided in two parts, 204 and 23232, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 20423232 in words is "twenty million, four hundred twenty-three thousand, two hundred thirty-two".