20009026640 has 80 divisors (see below), whose sum is σ = 49727817216. Its totient is φ = 7468876800.

The previous prime is 20009026633. The next prime is 20009026669. The reversal of 20009026640 is 4662090002.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×20009026640² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 57176 + ... + 208055.

Almost surely, 2^20009026640 is an apocalyptic number.

20009026640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20009026640 is an abundant number, since it is smaller than the sum of its proper divisors (29718790576).

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

20009026640 is a wasteful number, since it uses less digits than its factorization.

20009026640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265308 (or 265302 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 20009026640 in words is "twenty billion, nine million, twenty-six thousand, six hundred forty".