20747770 has 16 divisors (see below), whose sum is σ = 37820160. Its totient is φ = 8193744.

The previous prime is 20747767. The next prime is 20747777. The reversal of 20747770 is 7774702.

It is not an unprimeable number, because it can be changed into a prime (20747777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12342 + ... + 13921.

It is an arithmetic number, because the mean of its divisors is an integer number (2363760).

Almost surely, 2^20747770 is an apocalyptic number.

20747770 is a deficient number, since it is larger than the sum of its proper divisors (17072390).

20747770 is a wasteful number, since it uses less digits than its factorization.

20747770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26349.

The product of its (nonzero) digits is 19208, while the sum is 34.

The square root of 20747770 is about 4554.9720086956. The cubic root of 20747770 is about 274.7833886535.

The spelling of 20747770 in words is "twenty million, seven hundred forty-seven thousand, seven hundred seventy".