20816499 has 8 divisors (see below), whose sum is σ = 30278592. Its totient is φ = 12616040.

The previous prime is 20816489. The next prime is 20816503. The reversal of 20816499 is 99461802.

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

It is a cyclic number.

It is not a de Polignac number, because 20816499 - 2⁷ = 20816371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20816489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315369 + ... + 315434.

It is an arithmetic number, because the mean of its divisors is an integer number (3784824).

Almost surely, 2^20816499 is an apocalyptic number.

20816499 is a deficient number, since it is larger than the sum of its proper divisors (9462093).

20816499 is a wasteful number, since it uses less digits than its factorization.

20816499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630817.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 20816499 is about 4562.5101643722. The cubic root of 20816499 is about 275.0864697777.

The spelling of 20816499 in words is "twenty million, eight hundred sixteen thousand, four hundred ninety-nine".