20015038549489 has 9 divisors (see below), whose sum is σ = 20084897807233. Its totient is φ = 19945421483152.

The previous prime is 20015038549439. The next prime is 20015038549501. The reversal of 20015038549489 is 98494583051002.

It is a happy number.

The square root of 20015038549489 is 4473817.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4658107810225 + 15356930739264 = 2158265^2 + 3918792^2 .

It is not a de Polignac number, because 20015038549489 - 2⁹ = 20015038548977 is a prime.

It is a super-2 number, since 2×20015038549489² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20015038549439) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1310820747 + ... + 1310836015.

Almost surely, 2^{20015038549489} is an apocalyptic number.

20015038549489 is the 4473817-th square number.

20015038549489 is the 2236909-th centered octagonal number.

It is an amenable number.

20015038549489 is a deficient number, since it is larger than the sum of its proper divisors (69859257744).

20015038549489 is an frugal number, since it uses more digits than its factorization.

20015038549489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31124 (or 15562 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 58.

The spelling of 20015038549489 in words is "twenty trillion, fifteen billion, thirty-eight million, five hundred forty-nine thousand, four hundred eighty-nine".