20202051685 has 16 divisors (see below), whose sum is σ = 24522772032. Its totient is φ = 15975731200.

The previous prime is 20202051619. The next prime is 20202051721. The reversal of 20202051685 is 58615020202.

It is not a de Polignac number, because 20202051685 - 2⁷ = 20202051557 is a prime.

It is a super-2 number, since 2×20202051685² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 108330 + ... + 228340.

It is an arithmetic number, because the mean of its divisors is an integer number (1532673252).

Almost surely, 2^20202051685 is an apocalyptic number.

It is an amenable number.

20202051685 is a deficient number, since it is larger than the sum of its proper divisors (4320720347).

20202051685 is a wasteful number, since it uses less digits than its factorization.

20202051685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120404.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 20202051685 its reverse (58615020202), we get a palindrome (78817071887).

The spelling of 20202051685 in words is "twenty billion, two hundred two million, fifty-one thousand, six hundred eighty-five".