20403406404 has 36 divisors (see below), whose sum is σ = 51590005740. Its totient is φ = 6799193280.

The previous prime is 20403406399. The next prime is 20403406411. The reversal of 20403406404 is 40460430402.

It can be written as a sum of positive squares in 2 ways, for example, as 13982589504 + 6420816900 = 118248^2 + 80130^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20403406404² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49782 + ... + 208050.

It is an arithmetic number, because the mean of its divisors is an integer number (1433055715).

Almost surely, 2^20403406404 is an apocalyptic number.

It is an amenable number.

20403406404 is an abundant number, since it is smaller than the sum of its proper divisors (31186599336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20403406404 is a wasteful number, since it uses less digits than its factorization.

20403406404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161860 (or 161855 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20403406404 its reverse (40460430402), we get a palindrome (60863836806).

The spelling of 20403406404 in words is "twenty billion, four hundred three million, four hundred six thousand, four hundred four".