20916590 has 8 divisors (see below), whose sum is σ = 37649880. Its totient is φ = 8366632.

The previous prime is 20916589. The next prime is 20916673. The reversal of 20916590 is 9561902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1045820 + ... + 1045839.

It is an arithmetic number, because the mean of its divisors is an integer number (4706235).

Almost surely, 2^20916590 is an apocalyptic number.

20916590 is a deficient number, since it is larger than the sum of its proper divisors (16733290).

20916590 is a wasteful number, since it uses less digits than its factorization.

20916590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091666.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 20916590 is about 4573.4658629971. The cubic root of 20916590 is about 275.5266601561.

The spelling of 20916590 in words is "twenty million, nine hundred sixteen thousand, five hundred ninety".