20635512742563 has 64 divisors (see below), whose sum is σ = 30943879593984. Its totient is φ = 12169663488000.

The previous prime is 20635512742543. The next prime is 20635512742571. The reversal of 20635512742563 is 36524721553602.

It is not a de Polignac number, because 20635512742563 - 2¹⁰ = 20635512741539 is a prime.

It is a super-2 number, since 2×20635512742563² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (20635512742543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13741303 + ... + 15168863.

It is an arithmetic number, because the mean of its divisors is an integer number (483498118656).

Almost surely, 2^{20635512742563} is an apocalyptic number.

20635512742563 is a deficient number, since it is larger than the sum of its proper divisors (10308366851421).

20635512742563 is a wasteful number, since it uses less digits than its factorization.

20635512742563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427876.

The product of its (nonzero) digits is 9072000, while the sum is 51.

The spelling of 20635512742563 in words is "twenty trillion, six hundred thirty-five billion, five hundred twelve million, seven hundred forty-two thousand, five hundred sixty-three".