20040687 has 24 divisors (see below), whose sum is σ = 30700800. Its totient is φ = 12562128.

The previous prime is 20040679. The next prime is 20040689. The reversal of 20040687 is 78604002.

It is not a de Polignac number, because 20040687 - 2³ = 20040679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20040687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20040689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27514 + ... + 28232.

It is an arithmetic number, because the mean of its divisors is an integer number (1279200).

Almost surely, 2^20040687 is an apocalyptic number.

20040687 is a deficient number, since it is larger than the sum of its proper divisors (10660113).

20040687 is a wasteful number, since it uses less digits than its factorization.

20040687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20040687 is about 4476.6825887034. The cubic root of 20040687 is about 271.6257061626.

Adding to 20040687 its reverse (78604002), we get a palindrome (98644689).

The spelling of 20040687 in words is "twenty million, forty thousand, six hundred eighty-seven".