20137006685 has 8 divisors (see below), whose sum is σ = 25585843896. Its totient is φ = 15161981440.

The previous prime is 20137006661. The next prime is 20137006699. The reversal of 20137006685 is 58660073102.

20137006685 = 10799² + 10800² + ... + 10968².

It can be written as a sum of positive squares in 4 ways, for example, as 9071229049 + 11065777636 = 95243^2 + 105194^2 .

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

It is not a de Polignac number, because 20137006685 - 2¹⁴ = 20136990301 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 118452896 + ... + 118453065.

It is an arithmetic number, because the mean of its divisors is an integer number (3198230487).

Almost surely, 2^20137006685 is an apocalyptic number.

It is an amenable number.

20137006685 is a deficient number, since it is larger than the sum of its proper divisors (5448837211).

20137006685 is a wasteful number, since it uses less digits than its factorization.

20137006685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236905983.

The product of its (nonzero) digits is 60480, while the sum is 38.

Adding to 20137006685 its reverse (58660073102), we get a palindrome (78797079787).

The spelling of 20137006685 in words is "twenty billion, one hundred thirty-seven million, six thousand, six hundred eighty-five".