20515451514340 has 12 divisors (see below), whose sum is σ = 43082448180156. Its totient is φ = 8206180605728.

The previous prime is 20515451514317. The next prime is 20515451514391. The reversal of 20515451514340 is 4341515451502.

It can be written as a sum of positive squares in 2 ways, for example, as 6274503970816 + 14240947543524 = 2504896^2 + 3773718^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20515451514293 and 20515451514302.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 512886287839 + ... + 512886287878.

It is an arithmetic number, because the mean of its divisors is an integer number (3590204015013).

Almost surely, 2^{20515451514340} is an apocalyptic number.

20515451514340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20515451514340 is an abundant number, since it is smaller than the sum of its proper divisors (22566996665816).

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

20515451514340 is a wasteful number, since it uses less digits than its factorization.

20515451514340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025772575726 (or 1025772575724 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

Adding to 20515451514340 its reverse (4341515451502), we get a palindrome (24856966965842).

The spelling of 20515451514340 in words is "twenty trillion, five hundred fifteen billion, four hundred fifty-one million, five hundred fourteen thousand, three hundred forty".