20024999 has 4 divisors (see below), whose sum is σ = 20278560. Its totient is φ = 19771440.

The previous prime is 20024989. The next prime is 20025001. The reversal of 20024999 is 99942002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99942002 = 2 ⋅49971001.

It is a cyclic number.

It is not a de Polignac number, because 20024999 - 2¹⁶ = 19959463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20024959) 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, 126662 + ... + 126819.

It is an arithmetic number, because the mean of its divisors is an integer number (5069640).

Almost surely, 2^20024999 is an apocalyptic number.

20024999 is a deficient number, since it is larger than the sum of its proper divisors (253561).

20024999 is an equidigital number, since it uses as much as digits as its factorization.

20024999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253560.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20024999 is about 4474.9300553193. The cubic root of 20024999 is about 271.5548107806.

The spelling of 20024999 in words is "twenty million, twenty-four thousand, nine hundred ninety-nine".