20330781611 has 4 divisors (see below), whose sum is σ = 23235178992. Its totient is φ = 17426384232.

The previous prime is 20330781607. The next prime is 20330781617. The reversal of 20330781611 is 11618703302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20330781611 - 2² = 20330781607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20330781617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1452198680 + ... + 1452198693.

It is an arithmetic number, because the mean of its divisors is an integer number (5808794748).

Almost surely, 2^20330781611 is an apocalyptic number.

20330781611 is a deficient number, since it is larger than the sum of its proper divisors (2904397381).

20330781611 is an equidigital number, since it uses as much as digits as its factorization.

20330781611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904397380.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 20330781611 in words is "twenty billion, three hundred thirty million, seven hundred eighty-one thousand, six hundred eleven".