20402534010515 has 16 divisors (see below), whose sum is σ = 25327482364800. Its totient is φ = 15759075007872.

The previous prime is 20402534010479. The next prime is 20402534010527. The reversal of 20402534010515 is 51501043520402.

It is a cyclic number.

It is not a de Polignac number, because 20402534010515 - 2¹⁸ = 20402533748371 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20834774 + ... + 21792036.

It is an arithmetic number, because the mean of its divisors is an integer number (1582967647800).

Almost surely, 2^{20402534010515} is an apocalyptic number.

20402534010515 is a deficient number, since it is larger than the sum of its proper divisors (4924948354285).

20402534010515 is a wasteful number, since it uses less digits than its factorization.

20402534010515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104286.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 20402534010515 its reverse (51501043520402), we get a palindrome (71903577530917).

The spelling of 20402534010515 in words is "twenty trillion, four hundred two billion, five hundred thirty-four million, ten thousand, five hundred fifteen".