20776740 has 48 divisors (see below), whose sum is σ = 59535168. Its totient is φ = 5410944.

The previous prime is 20776739. The next prime is 20776741. The reversal of 20776740 is 4767702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20776739) and next prime (20776741).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20776741) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1447 + ... + 6606.

It is an arithmetic number, because the mean of its divisors is an integer number (1240316).

Almost surely, 2^20776740 is an apocalyptic number.

20776740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20776740 is an abundant number, since it is smaller than the sum of its proper divisors (38758428).

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

20776740 is a wasteful number, since it uses less digits than its factorization.

20776740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8108 (or 8106 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 33.

The square root of 20776740 is about 4558.1509408970. The cubic root of 20776740 is about 274.9112220317.

The spelling of 20776740 in words is "twenty million, seven hundred seventy-six thousand, seven hundred forty".