20715969181 has 8 divisors (see below), whose sum is σ = 21223254528. Its totient is φ = 20208780000.

The previous prime is 20715969161. The next prime is 20715969203. The reversal of 20715969181 is 18196951702.

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 20715969181 - 2¹³ = 20715960989 is a prime.

It is a super-2 number, since 2×20715969181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20715969121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621346 + ... + 653836.

It is an arithmetic number, because the mean of its divisors is an integer number (2652906816).

Almost surely, 2^20715969181 is an apocalyptic number.

It is an amenable number.

20715969181 is a deficient number, since it is larger than the sum of its proper divisors (507285347).

20715969181 is a wasteful number, since it uses less digits than its factorization.

20715969181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48083.

The product of its (nonzero) digits is 272160, while the sum is 49.

The spelling of 20715969181 in words is "twenty billion, seven hundred fifteen million, nine hundred sixty-nine thousand, one hundred eighty-one".