20502405200000 has 96 divisors (see below), whose sum is σ = 51052527624420. Its totient is φ = 8200961920000.

The previous prime is 20502405199999. The next prime is 20502405200009. The reversal of 20502405200000 is 250420502.

It can be written as a sum of positive squares in 6 ways, for example, as 7286155706944 + 13216249493056 = 2699288^2 + 3635416^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20502405200009) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 25228007 + ... + 26028006.

Almost surely, 2^{20502405200000} is an apocalyptic number.

20502405200000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20502405200000 is an abundant number, since it is smaller than the sum of its proper divisors (30550122424420).

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

20502405200000 is an frugal number, since it uses more digits than its factorization.

20502405200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51256052 (or 51256020 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

Adding to 20502405200000 its reverse (250420502), we get a palindrome (20502655620502).

The spelling of 20502405200000 in words is "twenty trillion, five hundred two billion, four hundred five million, two hundred thousand".