20755067564 has 72 divisors (see below), whose sum is σ = 46860283680. Its totient is φ = 7867791360.

The previous prime is 20755067561. The next prime is 20755067611. The reversal of 20755067564 is 46576055702.

It is not an unprimeable number, because it can be changed into a prime (20755067561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42572 + ... + 208140.

Almost surely, 2^20755067564 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 20755067564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23430141840).

20755067564 is an abundant number, since it is smaller than the sum of its proper divisors (26105216116).

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

20755067564 is a wasteful number, since it uses less digits than its factorization.

20755067564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165639 (or 165626 counting only the distinct ones).

The product of its (nonzero) digits is 1764000, while the sum is 47.

The spelling of 20755067564 in words is "twenty billion, seven hundred fifty-five million, sixty-seven thousand, five hundred sixty-four".