20677499 has 4 divisors (see below), whose sum is σ = 20689680. Its totient is φ = 20665320.

The previous prime is 20677477. The next prime is 20677507. The reversal of 20677499 is 99477602.

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 20677499 - 2¹² = 20673403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20677099) 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, 3032 + ... + 7109.

It is an arithmetic number, because the mean of its divisors is an integer number (5172420).

Almost surely, 2^20677499 is an apocalyptic number.

20677499 is a deficient number, since it is larger than the sum of its proper divisors (12181).

20677499 is a wasteful number, since it uses less digits than its factorization.

20677499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12180.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 20677499 is about 4547.2518074107. The cubic root of 20677499 is about 274.4728148056.

The spelling of 20677499 in words is "twenty million, six hundred seventy-seven thousand, four hundred ninety-nine".