20747233520 has 80 divisors (see below), whose sum is σ = 52136142240. Its totient is φ = 7632755712.

The previous prime is 20747233501. The next prime is 20747233543. The reversal of 20747233520 is 2533274702.

It is a Cunningham number, because it is equal to 144039²-1.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252071 + ... + 324089.

It is an arithmetic number, because the mean of its divisors is an integer number (651701778).

Almost surely, 2^20747233520 is an apocalyptic number.

20747233520 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 20747233520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26068071120).

20747233520 is an abundant number, since it is smaller than the sum of its proper divisors (31388908720).

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

20747233520 is a wasteful number, since it uses less digits than its factorization.

20747233520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72322 (or 72316 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 35.

The spelling of 20747233520 in words is "twenty billion, seven hundred forty-seven million, two hundred thirty-three thousand, five hundred twenty".