20423133340 has 24 divisors (see below), whose sum is σ = 42893473392. Its totient is φ = 8168321280.

The previous prime is 20423133331. The next prime is 20423133347. The reversal of 20423133340 is 4333132402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423133347) 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, 137460 + ... + 244420.

It is an arithmetic number, because the mean of its divisors is an integer number (1787228058).

Almost surely, 2^20423133340 is an apocalyptic number.

20423133340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20423133340 is an abundant number, since it is smaller than the sum of its proper divisors (22470340052).

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

20423133340 is a wasteful number, since it uses less digits than its factorization.

20423133340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116517 (or 116515 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 20423133340 its reverse (4333132402), we get a palindrome (24756265742).

The spelling of 20423133340 in words is "twenty billion, four hundred twenty-three million, one hundred thirty-three thousand, three hundred forty".