20665533536 has 12 divisors (see below), whose sum is σ = 40685269212. Its totient is φ = 10332766752.

The previous prime is 20665533439. The next prime is 20665533547. The reversal of 20665533536 is 63533556602.

It is a super-3 number, since 3×20665533536³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322898930 + ... + 322898993.

It is an arithmetic number, because the mean of its divisors is an integer number (3390439101).

Almost surely, 2^20665533536 is an apocalyptic number.

It is an amenable number.

20665533536 is a deficient number, since it is larger than the sum of its proper divisors (20019735676).

20665533536 is an equidigital number, since it uses as much as digits as its factorization.

20665533536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645797933 (or 645797925 counting only the distinct ones).

The product of its (nonzero) digits is 1458000, while the sum is 44.

The spelling of 20665533536 in words is "twenty billion, six hundred sixty-five million, five hundred thirty-three thousand, five hundred thirty-six".