20671461928 has 64 divisors (see below), whose sum is σ = 43349418000. Its totient is φ = 9175498752.

The previous prime is 20671461917. The next prime is 20671461929. The reversal of 20671461928 is 82916417602.

It can be written as a sum of positive squares in 8 ways, for example, as 18785991844 + 1885470084 = 137062^2 + 43422^2 .

It is not an unprimeable number, because it can be changed into a prime (20671461929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 761778 + ... + 788446.

Almost surely, 2^20671461928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20671461928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21674709000).

20671461928 is an abundant number, since it is smaller than the sum of its proper divisors (22677956072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20671461928 is a wasteful number, since it uses less digits than its factorization.

20671461928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26974 (or 26970 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 20671461928 in words is "twenty billion, six hundred seventy-one million, four hundred sixty-one thousand, nine hundred twenty-eight".