20671443760 has 160 divisors (see below), whose sum is σ = 56068179264. Its totient is φ = 7004160000.

The previous prime is 20671443739. The next prime is 20671443781. The reversal of 20671443760 is 6734417602.

It is an interprime number because it is at equal distance from previous prime (20671443739) and next prime (20671443781).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1504120 + ... + 1517800.

Almost surely, 2^20671443760 is an apocalyptic number.

20671443760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20671443760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28034089632).

20671443760 is an abundant number, since it is smaller than the sum of its proper divisors (35396735504).

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

20671443760 is a wasteful number, since it uses less digits than its factorization.

20671443760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13823 (or 13817 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The spelling of 20671443760 in words is "twenty billion, six hundred seventy-one million, four hundred forty-three thousand, seven hundred sixty".