20766340 has 24 divisors (see below), whose sum is σ = 49839552. Its totient is φ = 7119840.

The previous prime is 20766337. The next prime is 20766341. The reversal of 20766340 is 4366702.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 20766299 and 20766308.

It is not an unprimeable number, because it can be changed into a prime (20766341) 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, 74026 + ... + 74305.

It is an arithmetic number, because the mean of its divisors is an integer number (2076648).

Almost surely, 2^20766340 is an apocalyptic number.

20766340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20766340 is an abundant number, since it is smaller than the sum of its proper divisors (29073212).

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

20766340 is a wasteful number, since it uses less digits than its factorization.

20766340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148347 (or 148345 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 20766340 is about 4557.0099846281. The cubic root of 20766340 is about 274.8653445442.

The spelling of 20766340 in words is "twenty million, seven hundred sixty-six thousand, three hundred forty".