20205917853 has 16 divisors (see below), whose sum is σ = 29393253696. Its totient is φ = 12244832640.

The previous prime is 20205917843. The next prime is 20205917869. The reversal of 20205917853 is 35871950202.

It is a happy number.

It is not a de Polignac number, because 20205917853 - 2⁶ = 20205917789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205917803) 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, 422025 + ... + 467457.

It is an arithmetic number, because the mean of its divisors is an integer number (1837078356).

Almost surely, 2^20205917853 is an apocalyptic number.

It is an amenable number.

20205917853 is a deficient number, since it is larger than the sum of its proper divisors (9187335843).

20205917853 is a wasteful number, since it uses less digits than its factorization.

20205917853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58924.

The product of its (nonzero) digits is 151200, while the sum is 42.

It can be divided in two parts, 202059 and 17853, that added together give a palindrome (219912).

The spelling of 20205917853 in words is "twenty billion, two hundred five million, nine hundred seventeen thousand, eight hundred fifty-three".