20728784750 has 32 divisors (see below), whose sum is σ = 38955395232. Its totient is φ = 8259225600.

The previous prime is 20728784737. The next prime is 20728784761. The reversal of 20728784750 is 5748782702.

It is a Harshad number since it is a multiple of its sum of digits (50).

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 15 ways as a sum of consecutive naturals, for example, 97064 + ... + 225563.

It is an arithmetic number, because the mean of its divisors is an integer number (1217356101).

Almost surely, 2^20728784750 is an apocalyptic number.

20728784750 is a deficient number, since it is larger than the sum of its proper divisors (18226610482).

20728784750 is a wasteful number, since it uses less digits than its factorization.

20728784750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322901 (or 322891 counting only the distinct ones).

The product of its (nonzero) digits is 1756160, while the sum is 50.

The spelling of 20728784750 in words is "twenty billion, seven hundred twenty-eight million, seven hundred eighty-four thousand, seven hundred fifty".