20640087069 has 16 divisors (see below), whose sum is σ = 31526638080. Its totient is φ = 11766181680.

The previous prime is 20640087043. The next prime is 20640087103. The reversal of 20640087069 is 96078004602.

It is not a de Polignac number, because 20640087069 - 2¹⁷ = 20639955997 is a prime.

It is a super-2 number, since 2×20640087069² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20640087069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20640087269) 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, 1164067 + ... + 1181664.

It is an arithmetic number, because the mean of its divisors is an integer number (1970414880).

Almost surely, 2^20640087069 is an apocalyptic number.

It is an amenable number.

20640087069 is a deficient number, since it is larger than the sum of its proper divisors (10886551011).

20640087069 is a wasteful number, since it uses less digits than its factorization.

20640087069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346160.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 20640087069 in words is "twenty billion, six hundred forty million, eighty-seven thousand, sixty-nine".