20383721828 has 24 divisors (see below), whose sum is σ = 36060709944. Its totient is φ = 10080864000.

The previous prime is 20383721819. The next prime is 20383721843. The reversal of 20383721828 is 82812738302.

It can be written as a sum of positive squares in 4 ways, for example, as 14645356324 + 5738365504 = 121018^2 + 75752^2 .

It is a super-2 number, since 2×20383721828² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387776 + ... + 437192.

It is an arithmetic number, because the mean of its divisors is an integer number (1502529581).

Almost surely, 2^20383721828 is an apocalyptic number.

It is an amenable number.

20383721828 is a deficient number, since it is larger than the sum of its proper divisors (15676988116).

20383721828 is a wasteful number, since it uses less digits than its factorization.

20383721828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50543 (or 50541 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 20383721828 in words is "twenty billion, three hundred eighty-three million, seven hundred twenty-one thousand, eight hundred twenty-eight".