20730861 has 12 divisors (see below), whose sum is σ = 30039360. Its totient is φ = 13776840.

The previous prime is 20730839. The next prime is 20730869. The reversal of 20730861 is 16803702.

It is not a de Polignac number, because 20730861 - 2⁷ = 20730733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 501 + ... + 6458.

It is an arithmetic number, because the mean of its divisors is an integer number (2503280).

Almost surely, 2^20730861 is an apocalyptic number.

It is an amenable number.

20730861 is a deficient number, since it is larger than the sum of its proper divisors (9308499).

20730861 is a wasteful number, since it uses less digits than its factorization.

20730861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296 (or 7293 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20730861 is about 4553.1155267575. The cubic root of 20730861 is about 274.7087207879.

The spelling of 20730861 in words is "twenty million, seven hundred thirty thousand, eight hundred sixty-one".