20421440232 has 32 divisors (see below), whose sum is σ = 51059911680. Its totient is φ = 6806305280.

The previous prime is 20421440209. The next prime is 20421440233. The reversal of 20421440232 is 23204412402.

It is a super-2 number, since 2×20421440232² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20421440233) 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, 163768 + ... + 260120.

It is an arithmetic number, because the mean of its divisors is an integer number (1595622240).

Almost surely, 2^20421440232 is an apocalyptic number.

It is an amenable number.

20421440232 is an abundant number, since it is smaller than the sum of its proper divisors (30638471448).

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

20421440232 is a wasteful number, since it uses less digits than its factorization.

20421440232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105193 (or 105189 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20421440232 its reverse (23204412402), we get a palindrome (43625852634).

The spelling of 20421440232 in words is "twenty billion, four hundred twenty-one million, four hundred forty thousand, two hundred thirty-two".