20423532 has 24 divisors (see below), whose sum is σ = 48437872. Its totient is φ = 6696000.

The previous prime is 20423527. The next prime is 20423539. The reversal of 20423532 is 23532402.

It is a junction number, because it is equal to n+sod(n) for n = 20423499 and 20423508.

It is not an unprimeable number, because it can be changed into a prime (20423539) 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, 13219 + ... + 14682.

Almost surely, 2^20423532 is an apocalyptic number.

It is an amenable number.

20423532 is an abundant number, since it is smaller than the sum of its proper divisors (28014340).

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

20423532 is a wasteful number, since it uses less digits than its factorization.

20423532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27969 (or 27967 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20423532 is about 4519.2402016268. The cubic root of 20423532 is about 273.3444644816.

Adding to 20423532 its reverse (23532402), we get a palindrome (43955934).

The spelling of 20423532 in words is "twenty million, four hundred twenty-three thousand, five hundred thirty-two".