20339997 has 4 divisors (see below), whose sum is σ = 27120000. Its totient is φ = 13559996.

The previous prime is 20339983. The next prime is 20340011. The reversal of 20339997 is 79993302.

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 an interprime number because it is at equal distance from previous prime (20339983) and next prime (20340011).

It is a cyclic number.

It is not a de Polignac number, because 20339997 - 2⁸ = 20339741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20339947) 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, 3389997 + ... + 3390002.

It is an arithmetic number, because the mean of its divisors is an integer number (6780000).

Almost surely, 2^20339997 is an apocalyptic number.

It is an amenable number.

20339997 is a deficient number, since it is larger than the sum of its proper divisors (6780003).

20339997 is an equidigital number, since it uses as much as digits as its factorization.

20339997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780002.

The product of its (nonzero) digits is 91854, while the sum is 42.

The square root of 20339997 is about 4509.9885809168. The cubic root of 20339997 is about 272.9712833243.

The spelling of 20339997 in words is "twenty million, three hundred thirty-nine thousand, nine hundred ninety-seven".