20423442440 has 32 divisors (see below), whose sum is σ = 45960756480. Its totient is φ = 8167952832.

The previous prime is 20423442427. The next prime is 20423442443. The reversal of 20423442440 is 4424432402.

It is a super-3 number, since 3×20423442440³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20423442443) 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, 205097 + ... + 287943.

It is an arithmetic number, because the mean of its divisors is an integer number (1436273640).

Almost surely, 2^20423442440 is an apocalyptic number.

20423442440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20423442440 is an abundant number, since it is smaller than the sum of its proper divisors (25537314040).

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

20423442440 is a wasteful number, since it uses less digits than its factorization.

20423442440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89021 (or 89017 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 29.

Adding to 20423442440 its reverse (4424432402), we get a palindrome (24847874842).

The spelling of 20423442440 in words is "twenty billion, four hundred twenty-three million, four hundred forty-two thousand, four hundred forty".