20797766 has 16 divisors (see below), whose sum is σ = 36035280. Its totient is φ = 8897280.

The previous prime is 20797759. The next prime is 20797769. The reversal of 20797766 is 66779702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20797769) 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, 27431 + ... + 28178.

It is an arithmetic number, because the mean of its divisors is an integer number (2252205).

Almost surely, 2^20797766 is an apocalyptic number.

20797766 is a deficient number, since it is larger than the sum of its proper divisors (15237514).

20797766 is a wasteful number, since it uses less digits than its factorization.

20797766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55639.

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 20797766 is about 4560.4567753680. The cubic root of 20797766 is about 275.0039272166.

The spelling of 20797766 in words is "twenty million, seven hundred ninety-seven thousand, seven hundred sixty-six".