20643097 has 8 divisors (see below), whose sum is σ = 21067200. Its totient is φ = 20221584.

The previous prime is 20643061. The next prime is 20643107. The reversal of 20643097 is 79034602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20643097 - 2¹⁹ = 20118809 is a prime.

It is a super-2 number, since 2×20643097² = 852274907502818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20643197) 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, 25503 + ... + 26299.

It is an arithmetic number, because the mean of its divisors is an integer number (2633400).

Almost surely, 2^20643097 is an apocalyptic number.

It is an amenable number.

20643097 is a deficient number, since it is larger than the sum of its proper divisors (424103).

20643097 is an equidigital number, since it uses as much as digits as its factorization.

20643097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20643097 is about 4543.4675084125. The cubic root of 20643097 is about 274.3205130984.

Adding to 20643097 its reverse (79034602), we get a palindrome (99677699).

The spelling of 20643097 in words is "twenty million, six hundred forty-three thousand, ninety-seven".