20408354188 has 48 divisors (see below), whose sum is σ = 36524396160. Its totient is φ = 9976167936.

The previous prime is 20408354159. The next prime is 20408354203. The reversal of 20408354188 is 88145380402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12241731 + ... + 12243397.

It is an arithmetic number, because the mean of its divisors is an integer number (760924920).

Almost surely, 2^20408354188 is an apocalyptic number.

It is an amenable number.

20408354188 is a deficient number, since it is larger than the sum of its proper divisors (16116041972).

20408354188 is a wasteful number, since it uses less digits than its factorization.

20408354188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134 (or 2132 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 43.

The spelling of 20408354188 in words is "twenty billion, four hundred eight million, three hundred fifty-four thousand, one hundred eighty-eight".