20404217404 has 12 divisors (see below), whose sum is σ = 35709158128. Its totient is φ = 10201600800.

The previous prime is 20404217299. The next prime is 20404217419. The reversal of 20404217404 is 40471240402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28017 + ... + 203944.

Almost surely, 2^20404217404 is an apocalyptic number.

It is an amenable number.

20404217404 is a deficient number, since it is larger than the sum of its proper divisors (15304940724).

20404217404 is a wasteful number, since it uses less digits than its factorization.

20404217404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253956 (or 253954 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 28.

Adding to 20404217404 its reverse (40471240402), we get a palindrome (60875457806).

The spelling of 20404217404 in words is "twenty billion, four hundred four million, two hundred seventeen thousand, four hundred four".