20766353840 has 40 divisors (see below), whose sum is σ = 48319126128. Its totient is φ = 8300115200.

The previous prime is 20766353837. The next prime is 20766353851. The reversal of 20766353840 is 4835366702.

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

It is a junction number, because it is equal to n+sod(n) for n = 20766353791 and 20766353800.

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, 4319 + ... + 203841.

Almost surely, 2^20766353840 is an apocalyptic number.

20766353840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20766353840 is an abundant number, since it is smaller than the sum of its proper divisors (27552772288).

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

20766353840 is a wasteful number, since it uses less digits than its factorization.

20766353840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200837 (or 200831 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 44.

The spelling of 20766353840 in words is "twenty billion, seven hundred sixty-six million, three hundred fifty-three thousand, eight hundred forty".