20684499 has 16 divisors (see below), whose sum is σ = 30261504. Its totient is φ = 12463200.

The previous prime is 20684479. The next prime is 20684509. The reversal of 20684499 is 99448602.

It is not a de Polignac number, because 20684499 - 2¹⁵ = 20651731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20684499.

It is not an unprimeable number, because it can be changed into a prime (20684449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4242 + ... + 7704.

It is an arithmetic number, because the mean of its divisors is an integer number (1891344).

Almost surely, 2^20684499 is an apocalyptic number.

20684499 is a deficient number, since it is larger than the sum of its proper divisors (9577005).

20684499 is a wasteful number, since it uses less digits than its factorization.

20684499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3658.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 20684499 is about 4548.0214379442. The cubic root of 20684499 is about 274.5037839432.

The spelling of 20684499 in words is "twenty million, six hundred eighty-four thousand, four hundred ninety-nine".