20808361357 has 16 divisors (see below), whose sum is σ = 24057146880. Its totient is φ = 17628766848.

The previous prime is 20808361337. The next prime is 20808361363. The reversal of 20808361357 is 75316380802.

It is a de Polignac number, because none of the positive numbers 2^k-20808361357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808361337) 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, 2436028 + ... + 2444554.

It is an arithmetic number, because the mean of its divisors is an integer number (1503571680).

Almost surely, 2^20808361357 is an apocalyptic number.

It is an amenable number.

20808361357 is a deficient number, since it is larger than the sum of its proper divisors (3248785523).

20808361357 is an equidigital number, since it uses as much as digits as its factorization.

20808361357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12540.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 20808361357 in words is "twenty billion, eight hundred eight million, three hundred sixty-one thousand, three hundred fifty-seven".