20587939 has 4 divisors (see below), whose sum is σ = 20598424. Its totient is φ = 20577456.

The previous prime is 20587933. The next prime is 20587951. The reversal of 20587939 is 93978502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20587939 - 2¹³ = 20579747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20587895 and 20587904.

It is not an unprimeable number, because it can be changed into a prime (20587933) 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, 1317 + ... + 6550.

It is an arithmetic number, because the mean of its divisors is an integer number (5149606).

Almost surely, 2^20587939 is an apocalyptic number.

20587939 is a deficient number, since it is larger than the sum of its proper divisors (10485).

20587939 is an equidigital number, since it uses as much as digits as its factorization.

20587939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10484.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 20587939 is about 4537.3934147261. The cubic root of 20587939 is about 274.0759685990.

The spelling of 20587939 in words is "twenty million, five hundred eighty-seven thousand, nine hundred thirty-nine".