20766156 has 24 divisors (see below), whose sum is σ = 50018304. Its totient is φ = 6698640.

The previous prime is 20766143. The next prime is 20766203. The reversal of 20766156 is 65166702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27540 + ... + 28283.

It is an arithmetic number, because the mean of its divisors is an integer number (2084096).

Almost surely, 2^20766156 is an apocalyptic number.

It is an amenable number.

20766156 is an abundant number, since it is smaller than the sum of its proper divisors (29252148).

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

20766156 is a wasteful number, since it uses less digits than its factorization.

20766156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55861 (or 55859 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20766156 is about 4556.9897959069. The cubic root of 20766156 is about 274.8645327277.

The spelling of 20766156 in words is "twenty million, seven hundred sixty-six thousand, one hundred fifty-six".