20671758849 has 8 divisors (see below), whose sum is σ = 31499823040. Its totient is φ = 11812433616.

The previous prime is 20671758839. The next prime is 20671758907. The reversal of 20671758849 is 94885717602.

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

It is not a de Polignac number, because 20671758849 - 2¹³ = 20671750657 is a prime.

It is a super-2 number, since 2×20671758849² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20671758839) 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, 492184714 + ... + 492184755.

It is an arithmetic number, because the mean of its divisors is an integer number (3937477880).

Almost surely, 2^20671758849 is an apocalyptic number.

It is an amenable number.

20671758849 is a deficient number, since it is larger than the sum of its proper divisors (10828064191).

20671758849 is an equidigital number, since it uses as much as digits as its factorization.

20671758849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984369479.

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 20671758849 in words is "twenty billion, six hundred seventy-one million, seven hundred fifty-eight thousand, eight hundred forty-nine".