20202001685 has 16 divisors (see below), whose sum is σ = 24809431680. Its totient is φ = 15787759680.

The previous prime is 20202001661. The next prime is 20202001691. The reversal of 20202001685 is 58610020202.

It is not a de Polignac number, because 20202001685 - 2¹⁰ = 20202000661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222347 + ... + 299736.

It is an arithmetic number, because the mean of its divisors is an integer number (1550589480).

Almost surely, 2^20202001685 is an apocalyptic number.

It is an amenable number.

20202001685 is a deficient number, since it is larger than the sum of its proper divisors (4607429995).

20202001685 is a wasteful number, since it uses less digits than its factorization.

20202001685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522268.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 20202001685 its reverse (58610020202), we get a palindrome (78812021887).

The spelling of 20202001685 in words is "twenty billion, two hundred two million, one thousand, six hundred eighty-five".