40020855 has 32 divisors (see below), whose sum is σ = 73419264. Its totient is φ = 18235776.

The previous prime is 40020853. The next prime is 40020913. The reversal of 40020855 is 55802004.

It is not a de Polignac number, because 40020855 - 2¹ = 40020853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58777 + ... + 59453.

It is an arithmetic number, because the mean of its divisors is an integer number (2294352).

Almost surely, 2^40020855 is an apocalyptic number.

40020855 is a deficient number, since it is larger than the sum of its proper divisors (33398409).

40020855 is a wasteful number, since it uses less digits than its factorization.

40020855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 40020855 is about 6326.2038380059. The cubic root of 40020855 is about 342.0546149228.

Adding to 40020855 its reverse (55802004), we get a palindrome (95822859).

The spelling of 40020855 in words is "forty million, twenty thousand, eight hundred fifty-five".