20661618083 has 16 divisors (see below), whose sum is σ = 22910713920. Its totient is φ = 18533492736.

The previous prime is 20661618073. The next prime is 20661618113. The reversal of 20661618083 is 38081616602.

It is not a de Polignac number, because 20661618083 - 2²⁸ = 20393182627 is a prime.

It is a super-3 number, since 3×20661618083³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20661618083.

It is not an unprimeable number, because it can be changed into a prime (20661618073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12923 + ... + 203691.

It is an arithmetic number, because the mean of its divisors is an integer number (1431919620).

Almost surely, 2^20661618083 is an apocalyptic number.

20661618083 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20661618083 is a deficient number, since it is larger than the sum of its proper divisors (2249095837).

20661618083 is a wasteful number, since it uses less digits than its factorization.

20661618083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191086.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 20661618083 in words is "twenty billion, six hundred sixty-one million, six hundred eighteen thousand, eighty-three".