20273999 has 4 divisors (see below), whose sum is σ = 20576664. Its totient is φ = 19971336.

The previous prime is 20273989. The next prime is 20274011. The reversal of 20273999 is 99937202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99937202 = 2 ⋅49968601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20273999 is a prime.

It is a super-2 number, since 2×20273999² = 822070070904002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20273909) 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, 151232 + ... + 151365.

It is an arithmetic number, because the mean of its divisors is an integer number (5144166).

Almost surely, 2^20273999 is an apocalyptic number.

20273999 is a deficient number, since it is larger than the sum of its proper divisors (302665).

20273999 is an equidigital number, since it uses as much as digits as its factorization.

20273999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302664.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 20273999 is about 4502.6657659658. The cubic root of 20273999 is about 272.6757231492.

The spelling of 20273999 in words is "twenty million, two hundred seventy-three thousand, nine hundred ninety-nine".