20749626880 has 80 divisors (see below), whose sum is σ = 49823373600. Its totient is φ = 8287690752.

The previous prime is 20749626857. The next prime is 20749626907. The reversal of 20749626880 is 8862694702.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1855546 + ... + 1866694.

It is an arithmetic number, because the mean of its divisors is an integer number (622792170).

Almost surely, 2^20749626880 is an apocalyptic number.

20749626880 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 20749626880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24911686800).

20749626880 is an abundant number, since it is smaller than the sum of its proper divisors (29073746720).

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

20749626880 is an equidigital number, since it uses as much as digits as its factorization.

20749626880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11899 (or 11883 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 20749626880 in words is "twenty billion, seven hundred forty-nine million, six hundred twenty-six thousand, eight hundred eighty".