20730897 has 40 divisors (see below), whose sum is σ = 34499520. Its totient is φ = 12299040.

The previous prime is 20730893. The next prime is 20730917. The reversal of 20730897 is 79803702.

It is not a de Polignac number, because 20730897 - 2² = 20730893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20730893) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 47004 + ... + 47442.

It is an arithmetic number, because the mean of its divisors is an integer number (862488).

Almost surely, 2^20730897 is an apocalyptic number.

20730897 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20730897 is a deficient number, since it is larger than the sum of its proper divisors (13768623).

20730897 is a wasteful number, since it uses less digits than its factorization.

20730897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20730897 is about 4553.1194800927. The cubic root of 20730897 is about 274.7088798022.

The spelling of 20730897 in words is "twenty million, seven hundred thirty thousand, eight hundred ninety-seven".