20423413240 has 16 divisors (see below), whose sum is σ = 45952679880. Its totient is φ = 8169365280.

The previous prime is 20423413237. The next prime is 20423413249. The reversal of 20423413240 is 4231432402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423413249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255292626 + ... + 255292705.

Almost surely, 2^20423413240 is an apocalyptic number.

20423413240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20423413240 is an abundant number, since it is smaller than the sum of its proper divisors (25529266640).

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

20423413240 is a wasteful number, since it uses less digits than its factorization.

20423413240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510585342 (or 510585338 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20423413240 its reverse (4231432402), we get a palindrome (24654845642).

The spelling of 20423413240 in words is "twenty billion, four hundred twenty-three million, four hundred thirteen thousand, two hundred forty".