20689827738 has 32 divisors (see below), whose sum is σ = 44962621440. Its totient is φ = 6322866480.

The previous prime is 20689827731. The next prime is 20689827749. The reversal of 20689827738 is 83772898602.

It is a super-2 number, since 2×20689827738² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20689827731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2923720 + ... + 2930787.

It is an arithmetic number, because the mean of its divisors is an integer number (1405081920).

Almost surely, 2^20689827738 is an apocalyptic number.

20689827738 is an abundant number, since it is smaller than the sum of its proper divisors (24272793702).

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

20689827738 is a wasteful number, since it uses less digits than its factorization.

20689827738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5854562.

The product of its (nonzero) digits is 16257024, while the sum is 60.

The spelling of 20689827738 in words is "twenty billion, six hundred eighty-nine million, eight hundred twenty-seven thousand, seven hundred thirty-eight".