20356772061 has 8 divisors (see below), whose sum is σ = 27485937280. Its totient is φ = 13399394112.

The previous prime is 20356772057. The next prime is 20356772087. The reversal of 20356772061 is 16027765302.

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

It is not a de Polignac number, because 20356772061 - 2² = 20356772057 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356772041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42946540 + ... + 42947013.

It is an arithmetic number, because the mean of its divisors is an integer number (3435742160).

Almost surely, 2^20356772061 is an apocalyptic number.

It is an amenable number.

20356772061 is a deficient number, since it is larger than the sum of its proper divisors (7129165219).

20356772061 is an equidigital number, since it uses as much as digits as its factorization.

20356772061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85893635.

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 20356772061 in words is "twenty billion, three hundred fifty-six million, seven hundred seventy-two thousand, sixty-one".