20413405240 has 16 divisors (see below), whose sum is σ = 45930161880. Its totient is φ = 8165362080.

The previous prime is 20413405213. The next prime is 20413405241. The reversal of 20413405240 is 4250431402.

It is a happy number.

It is a super-2 number, since 2×20413405240² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413405241) 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, 255167526 + ... + 255167605.

Almost surely, 2^20413405240 is an apocalyptic number.

20413405240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20413405240 is an abundant number, since it is smaller than the sum of its proper divisors (25516756640).

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

20413405240 is a wasteful number, since it uses less digits than its factorization.

20413405240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510335142 (or 510335138 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20413405240 its reverse (4250431402), we get a palindrome (24663836642).

The spelling of 20413405240 in words is "twenty billion, four hundred thirteen million, four hundred five thousand, two hundred forty".