20687000069 has 4 divisors (see below), whose sum is σ = 21903882444. Its totient is φ = 19470117696.

The previous prime is 20687000029. The next prime is 20687000071. The reversal of 20687000069 is 96000078602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6318183169 + 14368816900 = 79487^2 + 119870^2 .

It is a cyclic number.

It is not a de Polignac number, because 20687000069 - 2⁸ = 20686999813 is a prime.

It is a super-2 number, since 2×20687000069² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20686999996 and 20687000041.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687000029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608441162 + ... + 608441195.

It is an arithmetic number, because the mean of its divisors is an integer number (5475970611).

Almost surely, 2^20687000069 is an apocalyptic number.

It is an amenable number.

20687000069 is a deficient number, since it is larger than the sum of its proper divisors (1216882375).

20687000069 is a wasteful number, since it uses less digits than its factorization.

20687000069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216882374.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 20687000069 in words is "twenty billion, six hundred eighty-seven million, sixty-nine", and thus it is an aban number.