20537795661 has 8 divisors (see below), whose sum is σ = 27691410240. Its totient is φ = 13538022432.

The previous prime is 20537795633. The next prime is 20537795669. The reversal of 20537795661 is 16659773502.

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

It is not a de Polignac number, because 20537795661 - 2¹⁰ = 20537794637 is a prime.

It is a super-2 number, since 2×20537795661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20537795669) 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, 38460025 + ... + 38460558.

It is an arithmetic number, because the mean of its divisors is an integer number (3461426280).

Almost surely, 2^20537795661 is an apocalyptic number.

It is an amenable number.

20537795661 is a deficient number, since it is larger than the sum of its proper divisors (7153614579).

20537795661 is an equidigital number, since it uses as much as digits as its factorization.

20537795661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76920675.

The product of its (nonzero) digits is 2381400, while the sum is 51.

The spelling of 20537795661 in words is "twenty billion, five hundred thirty-seven million, seven hundred ninety-five thousand, six hundred sixty-one".