20752491744 has 72 divisors (see below), whose sum is σ = 60128431272. Its totient is φ = 6786973440.

The previous prime is 20752491737. The next prime is 20752491779. The reversal of 20752491744 is 44719425702.

20752491744 is a `hidden beast` number, since 20 + 75 + 2 + 491 + 74 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 20752491744.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 664522 + ... + 695049.

It is an arithmetic number, because the mean of its divisors is an integer number (835117101).

Almost surely, 2^20752491744 is an apocalyptic number.

20752491744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20752491744 is an abundant number, since it is smaller than the sum of its proper divisors (39375939528).

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

20752491744 is a wasteful number, since it uses less digits than its factorization.

20752491744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359640 (or 1359629 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 20752491744 in words is "twenty billion, seven hundred fifty-two million, four hundred ninety-one thousand, seven hundred forty-four".