20667927169 has 4 divisors (see below), whose sum is σ = 20669864260. Its totient is φ = 20665990080.

The previous prime is 20667927139. The next prime is 20667927173. The reversal of 20667927169 is 96172976602.

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 14283118144 + 6384809025 = 119512^2 + 79905^2 .

It is a cyclic number.

It is not a de Polignac number, because 20667927169 - 2¹³ = 20667918977 is a prime.

It is a super-4 number, since 4×20667927169⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20667927139) 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, 952452 + ... + 973909.

It is an arithmetic number, because the mean of its divisors is an integer number (5167466065).

Almost surely, 2^20667927169 is an apocalyptic number.

It is an amenable number.

20667927169 is a deficient number, since it is larger than the sum of its proper divisors (1937091).

20667927169 is a wasteful number, since it uses less digits than its factorization.

20667927169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937090.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 20667927169 in words is "twenty billion, six hundred sixty-seven million, nine hundred twenty-seven thousand, one hundred sixty-nine".