20666666206 has 16 divisors (see below), whose sum is σ = 32795568000. Its totient is φ = 9740276568.

The previous prime is 20666666201. The next prime is 20666666291. The reversal of 20666666206 is 60266666602.

It is a super-2 number, since 2×20666666206² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20666666201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1358920 + ... + 1374043.

It is an arithmetic number, because the mean of its divisors is an integer number (2049723000).

Almost surely, 2^20666666206 is an apocalyptic number.

20666666206 is a deficient number, since it is larger than the sum of its proper divisors (12128901794).

20666666206 is a wasteful number, since it uses less digits than its factorization.

20666666206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733183.

The product of its (nonzero) digits is 1119744, while the sum is 46.

The spelling of 20666666206 in words is "twenty billion, six hundred sixty-six million, six hundred sixty-six thousand, two hundred six".