20563541989 has 16 divisors (see below), whose sum is σ = 22883333760. Its totient is φ = 18379215360.

The previous prime is 20563541987. The next prime is 20563542011. The reversal of 20563541989 is 98914536502.

It is not a de Polignac number, because 20563541989 - 2¹ = 20563541987 is a prime.

It is a super-2 number, since 2×20563541989² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563541981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134832 + ... + 243529.

It is an arithmetic number, because the mean of its divisors is an integer number (1430208360).

Almost surely, 2^20563541989 is an apocalyptic number.

It is an amenable number.

20563541989 is a deficient number, since it is larger than the sum of its proper divisors (2319791771).

20563541989 is a wasteful number, since it uses less digits than its factorization.

20563541989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378540.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 20563541989 in words is "twenty billion, five hundred sixty-three million, five hundred forty-one thousand, nine hundred eighty-nine".