20388353537 has 8 divisors (see below), whose sum is σ = 20434751400. Its totient is φ = 20342006784.

The previous prime is 20388353533. The next prime is 20388353543. The reversal of 20388353537 is 73535388302.

It can be written as a sum of positive squares in 4 ways, for example, as 1056510016 + 19331843521 = 32504^2 + 139039^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20388353537 - 2² = 20388353533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20388353491 and 20388353500.

It is not an unprimeable number, because it can be changed into a prime (20388353533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 851039 + ... + 874667.

It is an arithmetic number, because the mean of its divisors is an integer number (2554343925).

Almost surely, 2^20388353537 is an apocalyptic number.

It is an amenable number.

20388353537 is a deficient number, since it is larger than the sum of its proper divisors (46397863).

20388353537 is a wasteful number, since it uses less digits than its factorization.

20388353537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25555.

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 20388353537 in words is "twenty billion, three hundred eighty-eight million, three hundred fifty-three thousand, five hundred thirty-seven".