20940587 has 4 divisors (see below), whose sum is σ = 21093576. Its totient is φ = 20787600.

The previous prime is 20940551. The next prime is 20940599. The reversal of 20940587 is 78504902.

It is a happy number.

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 20940587 - 2¹⁶ = 20875051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20940547) 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, 76289 + ... + 76562.

It is an arithmetic number, because the mean of its divisors is an integer number (5273394).

Almost surely, 2^20940587 is an apocalyptic number.

20940587 is a deficient number, since it is larger than the sum of its proper divisors (152989).

20940587 is a wasteful number, since it uses less digits than its factorization.

20940587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152988.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20940587 is about 4576.0886136525. The cubic root of 20940587 is about 275.6319878148.

The spelling of 20940587 in words is "twenty million, nine hundred forty thousand, five hundred eighty-seven".