20706768 has 30 divisors (see below), whose sum is σ = 57950594. Its totient is φ = 6902208.

The previous prime is 20706767. The next prime is 20706787. The reversal of 20706768 is 86760702.

It can be written as a sum of positive squares in only one way, i.e., 11778624 + 8928144 = 3432^2 + 2988^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20706767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71755 + ... + 72042.

Almost surely, 2^20706768 is an apocalyptic number.

It is an amenable number.

20706768 is an abundant number, since it is smaller than the sum of its proper divisors (37243826).

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

20706768 is a wasteful number, since it uses less digits than its factorization.

20706768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143811 (or 143802 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 20706768 is about 4550.4689868188. The cubic root of 20706768 is about 274.6022591725.

The spelling of 20706768 in words is "twenty million, seven hundred six thousand, seven hundred sixty-eight".