40020671 has 4 divisors (see below), whose sum is σ = 40775832. Its totient is φ = 39265512.

The previous prime is 40020649. The next prime is 40020677. The reversal of 40020671 is 17602004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40020671 - 2¹⁸ = 39758527 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 (40020677) 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, 377501 + ... + 377606.

It is an arithmetic number, because the mean of its divisors is an integer number (10193958).

Almost surely, 2^40020671 is an apocalyptic number.

40020671 is a deficient number, since it is larger than the sum of its proper divisors (755161).

40020671 is an equidigital number, since it uses as much as digits as its factorization.

40020671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755160.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 40020671 is about 6326.1892953025. The cubic root of 40020671 is about 342.0540907116.

Adding to 40020671 its reverse (17602004), we get a palindrome (57622675).

The spelling of 40020671 in words is "forty million, twenty thousand, six hundred seventy-one".