20450013004240 has 80 divisors (see below), whose sum is σ = 47863040372928. Its totient is φ = 8125561433088.

The previous prime is 20450013004231. The next prime is 20450013004249. The reversal of 20450013004240 is 4240031005402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20450013004231) and next prime (20450013004249).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×20450013004240² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20450013004249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24535627 + ... + 25355413.

Almost surely, 2^{20450013004240} is an apocalyptic number.

20450013004240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20450013004240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23931520186464).

20450013004240 is an abundant number, since it is smaller than the sum of its proper divisors (27413027368688).

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

20450013004240 is a wasteful number, since it uses less digits than its factorization.

20450013004240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821876 (or 821870 counting only the distinct ones).

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

Adding to 20450013004240 its reverse (4240031005402), we get a palindrome (24690044009642).

The spelling of 20450013004240 in words is "twenty trillion, four hundred fifty billion, thirteen million, four thousand, two hundred forty".