20765156 has 6 divisors (see below), whose sum is σ = 36339030. Its totient is φ = 10382576.

The previous prime is 20765153. The next prime is 20765183. The reversal of 20765156 is 65156702.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 9205156 = 3400^2 + 3034^2 .

It is not an unprimeable number, because it can be changed into a prime (20765153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2595641 + ... + 2595648.

It is an arithmetic number, because the mean of its divisors is an integer number (6056505).

Almost surely, 2^20765156 is an apocalyptic number.

It is an amenable number.

20765156 is a deficient number, since it is larger than the sum of its proper divisors (15573874).

20765156 is a wasteful number, since it uses less digits than its factorization.

20765156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191293 (or 5191291 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 20765156 is about 4556.8800730324. The cubic root of 20765156 is about 274.8601205976.

The spelling of 20765156 in words is "twenty million, seven hundred sixty-five thousand, one hundred fifty-six".