20542207 has 8 divisors (see below), whose sum is σ = 23875200. Its totient is φ = 17308824.

The previous prime is 20542201. The next prime is 20542213. The reversal of 20542207 is 70224502.

It is an interprime number because it is at equal distance from previous prime (20542201) and next prime (20542213).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20542207 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 (20542201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24457 + ... + 25282.

It is an arithmetic number, because the mean of its divisors is an integer number (2984400).

Almost surely, 2^20542207 is an apocalyptic number.

20542207 is a deficient number, since it is larger than the sum of its proper divisors (3332993).

20542207 is an equidigital number, since it uses as much as digits as its factorization.

20542207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49805.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20542207 is about 4532.3511558572. The cubic root of 20542207 is about 273.8728831211.

Adding to 20542207 its reverse (70224502), we get a palindrome (90766709).

The spelling of 20542207 in words is "twenty million, five hundred forty-two thousand, two hundred seven".