20615540513012 has 6 divisors (see below), whose sum is σ = 36077195897778. Its totient is φ = 10307770256504.

The previous prime is 20615540512981. The next prime is 20615540513033. The reversal of 20615540513012 is 21031504551602.

It can be written as a sum of positive squares in only one way, i.e., 16073075247376 + 4542465265636 = 4009124^2 + 2131306^2 .

It is a super-2 number, since 2×20615540513012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2576942564123 + ... + 2576942564130.

It is an arithmetic number, because the mean of its divisors is an integer number (6012865982963).

Almost surely, 2^{20615540513012} is an apocalyptic number.

It is an amenable number.

20615540513012 is a deficient number, since it is larger than the sum of its proper divisors (15461655384766).

20615540513012 is a wasteful number, since it uses less digits than its factorization.

20615540513012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5153885128257 (or 5153885128255 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 20615540513012 in words is "twenty trillion, six hundred fifteen billion, five hundred forty million, five hundred thirteen thousand, twelve".