20540307 has 8 divisors (see below), whose sum is σ = 27510784. Its totient is φ = 13631688.

The previous prime is 20540293. The next prime is 20540329. The reversal of 20540307 is 70304502.

It is a happy number.

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

It is not a de Polignac number, because 20540307 - 2⁶ = 20540243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20541307) 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, 14683 + ... + 16020.

It is an arithmetic number, because the mean of its divisors is an integer number (3438848).

Almost surely, 2^20540307 is an apocalyptic number.

20540307 is a deficient number, since it is larger than the sum of its proper divisors (6970477).

20540307 is a wasteful number, since it uses less digits than its factorization.

20540307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30929.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 20540307 is about 4532.1415467745. The cubic root of 20540307 is about 273.8644391319.

Adding to 20540307 its reverse (70304502), we get a palindrome (90844809).

The spelling of 20540307 in words is "twenty million, five hundred forty thousand, three hundred seven".