20643062066 has 8 divisors (see below), whose sum is σ = 33779556144. Its totient is φ = 9383210020.

The previous prime is 20643062047. The next prime is 20643062071. The reversal of 20643062066 is 66026034602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20643062066² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469160480 + ... + 469160523.

It is an arithmetic number, because the mean of its divisors is an integer number (4222444518).

Almost surely, 2^20643062066 is an apocalyptic number.

20643062066 is a deficient number, since it is larger than the sum of its proper divisors (13136494078).

20643062066 is a wasteful number, since it uses less digits than its factorization.

20643062066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938321016.

The product of its (nonzero) digits is 62208, while the sum is 35.

Adding to 20643062066 its reverse (66026034602), we get a palindrome (86669096668).

The spelling of 20643062066 in words is "twenty billion, six hundred forty-three million, sixty-two thousand, sixty-six".