20661751219 has 8 divisors (see below), whose sum is σ = 20697137712. Its totient is φ = 20626388640.

The previous prime is 20661751217. The next prime is 20661751247. The reversal of 20661751219 is 91215716602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20661751219 - 2¹ = 20661751217 is a prime.

It is a super-2 number, since 2×20661751219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20661751217) 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 7 ways as a sum of consecutive naturals, for example, 2671492 + ... + 2679214.

It is an arithmetic number, because the mean of its divisors is an integer number (2587142214).

Almost surely, 2^20661751219 is an apocalyptic number.

20661751219 is a deficient number, since it is larger than the sum of its proper divisors (35386493).

20661751219 is an equidigital number, since it uses as much as digits as its factorization.

20661751219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11957.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 20661751219 in words is "twenty billion, six hundred sixty-one million, seven hundred fifty-one thousand, two hundred nineteen".