20923787544 has 192 divisors, whose sum is σ = 64086422400. Its totient is φ = 5653232640.

The previous prime is 20923787537. The next prime is 20923787557. The reversal of 20923787544 is 44578732902.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 926839 + ... + 949145.

It is an arithmetic number, because the mean of its divisors is an integer number (333783450).

Almost surely, 2^20923787544 is an apocalyptic number.

20923787544 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 20923787544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32043211200).

20923787544 is an abundant number, since it is smaller than the sum of its proper divisors (43162634856).

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

20923787544 is a wasteful number, since it uses less digits than its factorization.

20923787544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22374 (or 22359 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 51.

It can be divided in two parts, 209 and 23787544, that added together give a triangular number (23787753 = T₆₈₉₇).

The spelling of 20923787544 in words is "twenty billion, nine hundred twenty-three million, seven hundred eighty-seven thousand, five hundred forty-four".