20623899 has 4 divisors (see below), whose sum is σ = 27498536. Its totient is φ = 13749264.

The previous prime is 20623891. The next prime is 20623903. The reversal of 20623899 is 99832602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20623899 - 2³ = 20623891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20623891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3437314 + ... + 3437319.

It is an arithmetic number, because the mean of its divisors is an integer number (6874634).

Almost surely, 2^20623899 is an apocalyptic number.

20623899 is a deficient number, since it is larger than the sum of its proper divisors (6874637).

20623899 is an equidigital number, since it uses as much as digits as its factorization.

20623899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6874636.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 20623899 is about 4541.3543134180. The cubic root of 20623899 is about 274.2354477190.

The spelling of 20623899 in words is "twenty million, six hundred twenty-three thousand, eight hundred ninety-nine".