20171720404 has 24 divisors (see below), whose sum is σ = 38890940256. Its totient is φ = 9078180000.

The previous prime is 20171720399. The next prime is 20171720417. The reversal of 20171720404 is 40402717102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2265102 + ... + 2273989.

It is an arithmetic number, because the mean of its divisors is an integer number (1620455844).

Almost surely, 2^20171720404 is an apocalyptic number.

It is an amenable number.

20171720404 is a deficient number, since it is larger than the sum of its proper divisors (18719219852).

20171720404 is a wasteful number, since it uses less digits than its factorization.

20171720404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539207 (or 4539205 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The spelling of 20171720404 in words is "twenty billion, one hundred seventy-one million, seven hundred twenty thousand, four hundred four".