20510641066 has 16 divisors (see below), whose sum is σ = 32581184256. Its totient is φ = 9650448576.

The previous prime is 20510641061. The next prime is 20510641103. The reversal of 20510641066 is 66014601502.

It is not an unprimeable number, because it can be changed into a prime (20510641061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169105 + ... + 263851.

It is an arithmetic number, because the mean of its divisors is an integer number (2036324016).

Almost surely, 2^20510641066 is an apocalyptic number.

20510641066 is a deficient number, since it is larger than the sum of its proper divisors (12070543190).

20510641066 is a wasteful number, since it uses less digits than its factorization.

20510641066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101133.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 20510641066 in words is "twenty billion, five hundred ten million, six hundred forty-one thousand, sixty-six".