20297939 has 4 divisors (see below), whose sum is σ = 20308800. Its totient is φ = 20287080.

The previous prime is 20297903. The next prime is 20297969. The reversal of 20297939 is 93979202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20297939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20297896 and 20297905.

It is not an unprimeable number, because it can be changed into a prime (20297969) 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, 1832 + ... + 6629.

It is an arithmetic number, because the mean of its divisors is an integer number (5077200).

Almost surely, 2^20297939 is an apocalyptic number.

20297939 is a deficient number, since it is larger than the sum of its proper divisors (10861).

20297939 is an equidigital number, since it uses as much as digits as its factorization.

20297939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10860.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 20297939 is about 4505.3234068155. The cubic root of 20297939 is about 272.7830081679.

The spelling of 20297939 in words is "twenty million, two hundred ninety-seven thousand, nine hundred thirty-nine".