20830397 has 4 divisors (see below), whose sum is σ = 23806176. Its totient is φ = 17854620.

The previous prime is 20830393. The next prime is 20830399. The reversal of 20830397 is 79303802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20830397 - 2² = 20830393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20830391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1487879 + ... + 1487892.

It is an arithmetic number, because the mean of its divisors is an integer number (5951544).

Almost surely, 2^20830397 is an apocalyptic number.

It is an amenable number.

20830397 is a deficient number, since it is larger than the sum of its proper divisors (2975779).

20830397 is an equidigital number, since it uses as much as digits as its factorization.

20830397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2975778.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20830397 is about 4564.0329753410. The cubic root of 20830397 is about 275.1476760551.

The spelling of 20830397 in words is "twenty million, eight hundred thirty thousand, three hundred ninety-seven".