20340550640 has 40 divisors (see below), whose sum is σ = 47939626608. Its totient is φ = 8024762880.

The previous prime is 20340550627. The next prime is 20340550751. The reversal of 20340550640 is 4605504302.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1735646 + ... + 1747325.

Almost surely, 2^20340550640 is an apocalyptic number.

20340550640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20340550640 is an abundant number, since it is smaller than the sum of its proper divisors (27599075968).

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

20340550640 is a wasteful number, since it uses less digits than its factorization.

20340550640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483057 (or 3483051 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The spelling of 20340550640 in words is "twenty billion, three hundred forty million, five hundred fifty thousand, six hundred forty".