20409389898 has 16 divisors (see below), whose sum is σ = 41078773920. Its totient is φ = 6759797616.

The previous prime is 20409389813. The next prime is 20409389911. The reversal of 20409389898 is 89898390402.

It is a happy number.

It is a Curzon 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, 10832068 + ... + 10833951.

It is an arithmetic number, because the mean of its divisors is an integer number (2567423370).

Almost surely, 2^20409389898 is an apocalyptic number.

20409389898 is an abundant number, since it is smaller than the sum of its proper divisors (20669384022).

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

20409389898 is a wasteful number, since it uses less digits than its factorization.

20409389898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21666181.

The product of its (nonzero) digits is 8957952, while the sum is 60.

The spelling of 20409389898 in words is "twenty billion, four hundred nine million, three hundred eighty-nine thousand, eight hundred ninety-eight".