20651755102 has 12 divisors (see below), whose sum is σ = 34049794968. Its totient is φ = 9387161300.

The previous prime is 20651755079. The next prime is 20651755109. The reversal of 20651755102 is 20155715602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651755109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42668674 + ... + 42669157.

It is an arithmetic number, because the mean of its divisors is an integer number (2837482914).

Almost surely, 2^20651755102 is an apocalyptic number.

20651755102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20651755102 is a deficient number, since it is larger than the sum of its proper divisors (13398039866).

20651755102 is a wasteful number, since it uses less digits than its factorization.

20651755102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85337855 (or 85337844 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 34.

The spelling of 20651755102 in words is "twenty billion, six hundred fifty-one million, seven hundred fifty-five thousand, one hundred two".