20513144691009 has 40 divisors (see below), whose sum is σ = 30786362145000. Its totient is φ = 13611588427008.

The previous prime is 20513144690953. The next prime is 20513144691031. The reversal of 20513144691009 is 90019644131502.

20513144691009 is a `hidden beast` number, since 2 + 0 + 51 + 31 + 4 + 469 + 100 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3041605760400 + 17471538930609 = 1744020^2 + 4179897^2 .

It is not a de Polignac number, because 20513144691009 - 2¹² = 20513144686913 is a prime.

It is a super-2 number, since 2×20513144691009² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20513144691509) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22407927 + ... + 23305395.

It is an arithmetic number, because the mean of its divisors is an integer number (769659053625).

Almost surely, 2^{20513144691009} is an apocalyptic number.

It is an amenable number.

20513144691009 is a deficient number, since it is larger than the sum of its proper divisors (10273217453991).

20513144691009 is a wasteful number, since it uses less digits than its factorization.

20513144691009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898799 (or 898790 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 20513144691009 in words is "twenty trillion, five hundred thirteen billion, one hundred forty-four million, six hundred ninety-one thousand, nine".