20409596988 has 24 divisors (see below), whose sum is σ = 51951701760. Its totient is φ = 6184726320.

The previous prime is 20409596971. The next prime is 20409597001. The reversal of 20409596988 is 88969590402.

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, 77308948 + ... + 77309211.

It is an arithmetic number, because the mean of its divisors is an integer number (2164654240).

Almost surely, 2^20409596988 is an apocalyptic number.

It is an amenable number.

20409596988 is an abundant number, since it is smaller than the sum of its proper divisors (31542104772).

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

20409596988 is a wasteful number, since it uses less digits than its factorization.

20409596988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154618177 (or 154618175 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 60.

The spelling of 20409596988 in words is "twenty billion, four hundred nine million, five hundred ninety-six thousand, nine hundred eighty-eight".