20927471749 has 8 divisors (see below), whose sum is σ = 21328168320. Its totient is φ = 20528308416.

The previous prime is 20927471731. The next prime is 20927471797. The reversal of 20927471749 is 94717472902.

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 20927471749 - 2⁵ = 20927471717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20927471696 and 20927471705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20927474749) 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, 355732 + ... + 410365.

It is an arithmetic number, because the mean of its divisors is an integer number (2666021040).

Almost surely, 2^20927471749 is an apocalyptic number.

It is an amenable number.

20927471749 is a deficient number, since it is larger than the sum of its proper divisors (400696571).

20927471749 is an equidigital number, since it uses as much as digits as its factorization.

20927471749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766619.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 20927471749 in words is "twenty billion, nine hundred twenty-seven million, four hundred seventy-one thousand, seven hundred forty-nine".