20702053557111 has 16 divisors (see below), whose sum is σ = 28483112359808. Its totient is φ = 13364717536800.

The previous prime is 20702053557103. The next prime is 20702053557137. The reversal of 20702053557111 is 11175535020702.

It is a happy number.

It is not a de Polignac number, because 20702053557111 - 2³ = 20702053557103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20702053557111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20702053557161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441931525 + ... + 441978366.

It is an arithmetic number, because the mean of its divisors is an integer number (1780194522488).

Almost surely, 2^{20702053557111} is an apocalyptic number.

20702053557111 is a deficient number, since it is larger than the sum of its proper divisors (7781058802697).

20702053557111 is a wasteful number, since it uses less digits than its factorization.

20702053557111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883910142.

The product of its (nonzero) digits is 73500, while the sum is 39.

Adding to 20702053557111 its reverse (11175535020702), we get a palindrome (31877588577813).

The spelling of 20702053557111 in words is "twenty trillion, seven hundred two billion, fifty-three million, five hundred fifty-seven thousand, one hundred eleven".