20730555 has 24 divisors (see below), whose sum is σ = 36065952. Its totient is φ = 11015424.

The previous prime is 20730551. The next prime is 20730569. The reversal of 20730555 is 55503702.

It is not a de Polignac number, because 20730555 - 2² = 20730551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20730551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14482 + ... + 15848.

It is an arithmetic number, because the mean of its divisors is an integer number (1502748).

Almost surely, 2^20730555 is an apocalyptic number.

20730555 is a deficient number, since it is larger than the sum of its proper divisors (15335397).

20730555 is a wasteful number, since it uses less digits than its factorization.

20730555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715 (or 1712 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 27.

The square root of 20730555 is about 4553.0819232691. The cubic root of 20730555 is about 274.7073691592.

The spelling of 20730555 in words is "twenty million, seven hundred thirty thousand, five hundred fifty-five".