20667069 has 10 divisors (see below), whose sum is σ = 30873150. Its totient is φ = 13777992.

The previous prime is 20667067. The next prime is 20667107. The reversal of 20667069 is 96076602.

It can be written as a sum of positive squares in only one way, i.e., 19686969 + 980100 = 4437^2 + 990^2 .

It is not a de Polignac number, because 20667069 - 2¹ = 20667067 is a prime.

It is a super-2 number, since 2×20667069² = 854255482101522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20667061) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 127494 + ... + 127655.

It is an arithmetic number, because the mean of its divisors is an integer number (3087315).

Almost surely, 2^20667069 is an apocalyptic number.

It is an amenable number.

20667069 is a deficient number, since it is larger than the sum of its proper divisors (10206081).

20667069 is an equidigital number, since it uses as much as digits as its factorization.

20667069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255161 (or 255152 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20667069 is about 4546.1048162135. The cubic root of 20667069 is about 274.4266578223.

The spelling of 20667069 in words is "twenty million, six hundred sixty-seven thousand, sixty-nine".