20671244064 has 240 divisors, whose sum is σ = 62764244928. Its totient is φ = 6696628992.

The previous prime is 20671244017. The next prime is 20671244117. The reversal of 20671244064 is 46044217602.

20671244064 is a `hidden beast` number, since 206 + 7 + 1 + 2 + 440 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23304229 + ... + 23305115.

Almost surely, 2^20671244064 is an apocalyptic number.

20671244064 is a gapful number since it is divisible by the number (24) 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 20671244064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31382122464).

20671244064 is an abundant number, since it is smaller than the sum of its proper divisors (42093000864).

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

20671244064 is an frugal number, since it uses more digits than its factorization.

20671244064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The spelling of 20671244064 in words is "twenty billion, six hundred seventy-one million, two hundred forty-four thousand, sixty-four".