20756740 has 24 divisors (see below), whose sum is σ = 45884160. Its totient is φ = 7865568.

The previous prime is 20756719. The next prime is 20756777. The reversal of 20756740 is 4765702.

It is a zygodrome in base 3.

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 7 ways as a sum of consecutive naturals, for example, 26932 + ... + 27691.

It is an arithmetic number, because the mean of its divisors is an integer number (1911840).

Almost surely, 2^20756740 is an apocalyptic number.

20756740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20756740 is an abundant number, since it is smaller than the sum of its proper divisors (25127420).

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

20756740 is a wasteful number, since it uses less digits than its factorization.

20756740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54651 (or 54649 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 20756740 is about 4555.9565406180. The cubic root of 20756740 is about 274.8229824970.

The spelling of 20756740 in words is "twenty million, seven hundred fifty-six thousand, seven hundred forty".