20766940 has 24 divisors (see below), whose sum is σ = 43756272. Its totient is φ = 8279040.

The previous prime is 20766919. The next prime is 20766947. The reversal of 20766940 is 4966702.

It is a junction number, because it is equal to n+sod(n) for n = 20766896 and 20766905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20766947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5052 + ... + 8188.

It is an arithmetic number, because the mean of its divisors is an integer number (1823178).

Almost surely, 2^20766940 is an apocalyptic number.

20766940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20766940 is an abundant number, since it is smaller than the sum of its proper divisors (22989332).

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

20766940 is a wasteful number, since it uses less digits than its factorization.

20766940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477 (or 3475 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20766940 is about 4557.0758167930. The cubic root of 20766940 is about 274.8679917386.

The spelling of 20766940 in words is "twenty million, seven hundred sixty-six thousand, nine hundred forty".