20006665536 has 112 divisors (see below), whose sum is σ = 62188636608. Its totient is φ = 5596262400.

The previous prime is 20006665531. The next prime is 20006665537. The reversal of 20006665536 is 63556660002.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 20006665494 and 20006665503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006665531) 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 15 ways as a sum of consecutive naturals, for example, 336885 + ... + 391796.

It is an arithmetic number, because the mean of its divisors is an integer number (555255684).

Almost surely, 2^20006665536 is an apocalyptic number.

20006665536 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20006665536 is an abundant number, since it is smaller than the sum of its proper divisors (42181971072).

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

20006665536 is a wasteful number, since it uses less digits than its factorization.

20006665536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728720 (or 728710 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 39.

The spelling of 20006665536 in words is "twenty billion, six million, six hundred sixty-five thousand, five hundred thirty-six".