20409891589689 has 16 divisors (see below), whose sum is σ = 32930245254528. Its totient is φ = 10976748417792.

The previous prime is 20409891589687. The next prime is 20409891589691. The reversal of 20409891589689 is 98698519890402.

It is an interprime number because it is at equal distance from previous prime (20409891589687) and next prime (20409891589691).

It is not a de Polignac number, because 20409891589689 - 2¹ = 20409891589687 is a prime.

It is a super-2 number, since 2×20409891589689² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20409891589687) 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, 28585281982 + ... + 28585282695.

It is an arithmetic number, because the mean of its divisors is an integer number (2058140328408).

Almost surely, 2^{20409891589689} is an apocalyptic number.

It is an amenable number.

20409891589689 is a deficient number, since it is larger than the sum of its proper divisors (12520353664839).

20409891589689 is a wasteful number, since it uses less digits than its factorization.

20409891589689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57170564704.

The product of its (nonzero) digits is 806215680, while the sum is 78.

The spelling of 20409891589689 in words is "twenty trillion, four hundred nine billion, eight hundred ninety-one million, five hundred eighty-nine thousand, six hundred eighty-nine".