20842307 has 4 divisors (see below), whose sum is σ = 20851800. Its totient is φ = 20832816.

The previous prime is 20842279. The next prime is 20842319. The reversal of 20842307 is 70324802.

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 not a de Polignac number, because 20842307 - 2⁶ = 20842243 is a prime.

It is a super-2 number, since 2×20842307² = 868803522164498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20842337) 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, 428 + ... + 6470.

It is an arithmetic number, because the mean of its divisors is an integer number (5212950).

Almost surely, 2^20842307 is an apocalyptic number.

20842307 is a deficient number, since it is larger than the sum of its proper divisors (9493).

20842307 is an equidigital number, since it uses as much as digits as its factorization.

20842307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9492.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20842307 is about 4565.3375559755. The cubic root of 20842307 is about 275.2001055962.

The spelling of 20842307 in words is "twenty million, eight hundred forty-two thousand, three hundred seven".