20317755405 has 16 divisors (see below), whose sum is σ = 32512100544. Its totient is φ = 10834905600.

The previous prime is 20317755401. The next prime is 20317755439. The reversal of 20317755405 is 50455771302.

It is a happy number.

It is not a de Polignac number, because 20317755405 - 2² = 20317755401 is a prime.

It is a super-2 number, since 2×20317755405² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317755401) 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, 68430 + ... + 212880.

It is an arithmetic number, because the mean of its divisors is an integer number (2032006284).

Almost surely, 2^20317755405 is an apocalyptic number.

It is an amenable number.

20317755405 is a deficient number, since it is larger than the sum of its proper divisors (12194345139).

20317755405 is a wasteful number, since it uses less digits than its factorization.

20317755405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153836.

The product of its (nonzero) digits is 147000, while the sum is 39.

The spelling of 20317755405 in words is "twenty billion, three hundred seventeen million, seven hundred fifty-five thousand, four hundred five".