20747766 has 32 divisors (see below), whose sum is σ = 44862048. Its totient is φ = 6359040.

The previous prime is 20747737. The next prime is 20747767. The reversal of 20747766 is 66774702.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35670 + ... + 36246.

It is an arithmetic number, because the mean of its divisors is an integer number (1401939).

Almost surely, 2^20747766 is an apocalyptic number.

20747766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20747766 is an abundant number, since it is smaller than the sum of its proper divisors (24114282).

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

20747766 is a wasteful number, since it uses less digits than its factorization.

20747766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 98784, while the sum is 39.

The square root of 20747766 is about 4554.9715696149. The cubic root of 20747766 is about 274.7833709949.

The spelling of 20747766 in words is "twenty million, seven hundred forty-seven thousand, seven hundred sixty-six".