20402240240040 has 64 divisors (see below), whose sum is σ = 63867882499200. Its totient is φ = 5204049683712.

The previous prime is 20402240240029. The next prime is 20402240240101. The reversal of 20402240240040 is 4004204220402.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3696055255 + ... + 3696060774.

It is an arithmetic number, because the mean of its divisors is an integer number (997935664050).

Almost surely, 2^{20402240240040} is an apocalyptic number.

20402240240040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402240240040 is an abundant number, since it is smaller than the sum of its proper divisors (43465642259160).

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

20402240240040 is a wasteful number, since it uses less digits than its factorization.

20402240240040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7392116066 (or 7392116062 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 20402240240040 its reverse (4004204220402), we get a palindrome (24406444460442).

The spelling of 20402240240040 in words is "twenty trillion, four hundred two billion, two hundred forty million, two hundred forty thousand, forty".