20531665110 has 64 divisors (see below), whose sum is σ = 53786695680. Its totient is φ = 4974497280.

The previous prime is 20531665073. The next prime is 20531665111. The reversal of 20531665110 is 1156613502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531665111) 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 31 ways as a sum of consecutive naturals, for example, 584526 + ... + 618654.

It is an arithmetic number, because the mean of its divisors is an integer number (840417120).

Almost surely, 2^20531665110 is an apocalyptic number.

20531665110 is an abundant number, since it is smaller than the sum of its proper divisors (33255030570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20531665110 is a wasteful number, since it uses less digits than its factorization.

20531665110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35973.

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 20531665110 in words is "twenty billion, five hundred thirty-one million, six hundred sixty-five thousand, one hundred ten".